Hi Jessa37 and welcome.
It must be very painful to watch your child struggle and not know how to help. You have definitely come to the right place.
Here you find a supportive community of individuals who also struggle interacting with loved ones with BPD. There is hope! I suggest you read through and participate in some of the threads here to find others with common experiences.
A BPD diagnosis is often made alongside other disorders. What particular behaviors make you think she has BPD?
~ROE