I'm negative, my duaghter is positive and we live in same house

Stay put, you aren't allowed to just book yourself into a hotel room, you've been in contact with a positive case, you need to isolate, your worried for you but think of the many others you could be putting at risk by leaving the house

I can't speak about what the legal requirements are but my conscience would not allow me to do anything else apart from isolate with my daughter.
It will be inconvenient but it will be much more than inconvenient if you have caught it in the time you have been deliberating or if your test result was wrong.

In your position, I would look after your daughter, look after myself, protect everyone else, stay home and not be selfish.