Help 😭

I thought this phase would be over with by now but what if it’s not even a phase 😭😫 Nova still won’t go to ANYONE BUT ME AND HER DAD. Please i don’t understand how this even started and why ?!?!?!??!?!?!???! yesterday she got herself in such a state when my boyfriends mum held her she was actually sick. This is the complete OPPOSITE to how she normally is. I try to not take her back straight away if she starts crying but then she gets in such a state I don’t want to stress her out anymore then she already is so of course I take her back to soothe her. I don’t know what to do :(((