sudden downwards spiral in 3yo behaviour

[losingallmarbles]

dd1 was 3 in January. She has been dry in the day since September and was dry at night for about 2 weeks. About 4 weeks ago she got a cough, and wet herself two night running, so I put her back in nappies at night.

She is now having 3-4 accidents a day, and has started hitting her 10mo sister. I think they are related, and are attention seekers.

We are due to go on holiday next week. This involves a five hour drive each way, and a day with the in-laws, which is always stressful (FIL is very, very bad tempered - to everyone, not just kids). We are staying in a B&B which I don't think is particularly child friendly. What am supposed to do? cancel the holiday? put her back in nappies?

I am trying to ignore the bad and praise the good, but she is getting worse every day - She used to be very sweet with her sister who now has two huge bruises on her forehead.

She is still very young, I thought I had it cracked too but at 4 she has started all over again too!! Just pack nappies, enjoy your holiday and try again when you get back. Can't advise on the sister bashing I'm afraid unless it's related to her being annoyed at herself for slipping up?

Thick trousers... DS (3.5) is still terrible at stopping what he's doing and using the loo. At least when wearing cords, is less likley to be standing in a puddle, or totally soaking into somewhere!
Don't go back to nappies, it's a huge step back. Night time pants are OK though (IMO).
Also,when things slip, I introduce a new sticker chart. Suggest something she wants and give stickers so she can work towards it, for using the loo.

DS1 also has phases of hiting his little brother (15m), again I also feel it's attention seeking, but it's hard not to be fussing over the little one. I try really really hard to praise him, but somethimes he just has 'playing up' days. I have resorted to "If you do that again you loose your favourite toy until we have a day of no bashing".

Thank you. I don't feel that it is a case having genuine accidents as she used to get very upset by them, but a deliberate act to wind me (or DH or DM)up. She laughs about it afterwards. Also she has no accidents in public, just at home. She has already lost so many things I am struggling to decide which ones that are left matter to her.