Damn, if Wolfwoodd comments on a thread it makes it really hard to add anything
I also dated a girl like this before we were in a realtionship for 4 months. HB9.5, 22yo bisexual. What I learnt that I shoulnd't have went for a realtionship because that was all about drama and her making up shit tests. I should have been just fucking her every once in a while.
Not every girl is capable of a LTR. Just as not every girl makes a good fuck buddy (they become too needy and fall in love).
Some girls are simply unable to be long term GFs, some girls are simply unable to become fuck buddies.
Not everything is black and white tho.
To answer your question, she is capable of having a good relationship but this is most likely not a monogamous one. I don't think its the type of relationship you are looking for now.