To send my

[UnlawfulBananaPeeler]

Almost 4 year old to her room for biting her 2y/o brother?

I sent her to her room (which I never ever do) and said she wasn’t going to the park.
She was really upset (not about the biting)
She also proudly announced this morning she had bitten herself.

She has never bitten before even when she was small. I have explained how bad it is to bite and how upset I was and her little brother.
I’m not sure if I made too much of a fuss

Plus I feel the guilt for sending her to her room

I don't think you've made too much fuss, in your shoes I'd be curious to know where she's picked the behaviour up from though, are there other children she's spent time with recently?

She goes to Pre school but we’re on summer hols at the minute. She’s picked up some horrible habits (talking silly and teasing ect) but I just assumed that’s kids stuff.
But she’s not done thins before the last few days .
She said she did it ‘because she just really likes to bite’
Do they get teeth at this age?

yanbu.

however if she proves she is sorry then maybe you could still take her to the park.