I think it's pretty common at that age. Its a 'bad' time for separation anxiety and needing mum close by. DD was shocking from 7- 15 months, wouldnt let anyone near her except me. You dont need to teach her to self settle again, hun, it's something she will go back to in her own time. It might not seem like it but it will happen eventually

Do you have a copy of the Wonder Weeks book? Its really good at explaining what's going on in little brains and why they are so clingy at particular stages of development.

Sleep deprivation is hard and it is hard when you think that your bub is reverting back to a newborn but just remember this will pass