sudden change in 4 year old dd behaviour in school and at home

[Vampyhooch1987]

Over the last few weeks I’ve noticed a rapid change in my daughters behaviour. She’s 4 and goes to full time primary school(we live in wales).
I’ve had a long message off her teacher saying the same thing. That her behaviour has been really bad in school for the last few weeks.
some of the behaviour :
interrupting when others are speaking
making silly noises when the teacher has asked her to stop.
doing things even though she’s been told no
having a tantrum over the slightest thing
laughing when being told off
Her teacher has also said she has been ‘shouting out’ and singing inappropriately on the carpet.
Generally she just isn’t listening, and it’s not that she can’t hear us.
Its now worrying me as it’s happening at both home and school and I really don’t know why or what I can do to help.
she has a reward chart which helps a bit but not a huge amount.
any advice?