Hello Worriedmum99 and welcome to bpdfamily
I'm glad you've found us and sorry what you are dealing with your teen daughter, many parents are in similar situations, you are not alone.
Well done for taking up yoga

have you seen to your right the tool
be self-aware and of wisemind, there is also a link within to a workshop discussing mindfulness I found really helpful. My DD has learnt many of the skills to the right in DBT.
Is your DD receiving treatment, how old is she?
WDx