Behavioral Changes In My Dd

My 3+ years old DD has been very much potty trained since a very long time. Its been a while (I guess more than a year) since we used a diaper for her.
She could very much understand her need to pee, request it when needed, and use the wash room or her potty seat properly.
She goes to the nursery since January, and manages there without any potty accidents so far.
We also travel a lot, and she never uses a diaper while in travelling mode (even if that is a whole day trip).

However, since the past few months (precisely 4 months, i guess), she pees while in sleep. Even if that is a short nap in the afternoon, she accidentally pees in the bed, and wakes up with loads of embarrassment. She cries immediately with a fear of getting scold. But we say, it is okay, and never scold her for this, although it requires a lot of work aftermath.

Earlier it looked as if it is an accident though, but of late, bed wetting has become a daily issue. Particularly she wets her bed even during afternoon while napping.

I tried loads of remedies such as making/rather forcing her to pee several times before bed time, giving her less water at night, and reminding her not to pee (in case if that could help).
We switched her to a different room, where there is no AC. I go and co sleep with her there.

She is otherwise normal. She plays, progress so well in her nursery by getting a few good stars, and likes her teachers pretty much.
She is loved, pampered much by all at home.
The only difference since the past few months in her life is that, she spends more time at her paternal grandparents' house than before. She is attached to them, and often cries to go there after nursery times. They are our neighbors anyways.

Co-incidentally her behavior has weirdly changed since the past few months too.
Earlier she used to be very calm and polite kid. Everyone loved her for her calmness and silent nature.
Even if other kids (cousins) hit her, she won't react much. She would prefer to apologize them or ignore them. But never try to make a scene unlike other kids.
Her maturity for her age is what everyone loved about her.

Now that (well before joining School) her behavior has changed. Gradually though, so we did not felt alarming.
She cries a lot. Makes unwanted drama even if the issue is very small - like if someone snatched a chocolate from her hand or touched her hair or so. She would cry loud, fall on the floor and throw a lot of tantrums.
She throws away the stuff to show her displeasure, which is really impolite and indecent.

But otherwise she is doing great. No weight loss, no appetite loss, learning too fast, reciting poems and rhymes and all, sleeping enough, affectionate with everyone, playing, and is of course very talented for her age.

Is this normal or alarming? Is there any physiological issue? before I decide to take her to any specialists, I would like to hear your insights, please.

 

Thanks... she is perfectly fine during day time. No diapers while in school or even during long trips. She can control and let us know when there is urge to pee.
Problem is bed wetting only. Both at night and day during sleep.

 

Thanks @Laks09 for the info...

My worry is that she was very much in control previously, and did not use a diaper since 1.8 yrs until recently.
After a very long time, she woke up without bed wetting this morning.

As for the afternoon nap, the only thing that I could notice is, she doesn't wet the bed if she sleeps in her bed. But my mom (her care taker during day time) usually make her sleep in the living room in a mat - so that she gets some fresh air and ventilation, unlike the rooms, which are fully closed with AC.
She doesn't wet the bed during the weekends as she naps with me inside the room only.
Perhaps the cool tiles may be a reason, since these are very cooling foggy days here.

As you rightly said, she wets as soon as she gets up from the nap. Mom takes a while to reach her out, since she may be doing something else in the kitchen or other rooms, also mom has hearing problems too. My girl is too pampered that she needs someone to take her to the loo, no matter how urgent it may be.

Also, as you said, both my kids were perfect when they were 2. But their 3-4s are terrible