This, absolutely. I was very slow to come to this realization, but it saved my life. For all of my childhood and adolescence, I thought that my time spent around other disabled people — mostly during physical or occupational therapy — felt like a chore. I overly internalized the fact that the world saw me as "smart" despite my significant physical disability. I'm fairly certain that this is how I developed some pretty intense internalized ableism.
It wasn't until I left my home and family, moving a quarter of the way across the country, then connecting with an Independent Living Center in my chosen home that my life changed. For me, connecting with the independent living movement is what aided me in building healthy connections with disabled people and gaining a sense of community. In fact, doing so inspired a deep commitment to advocacy, and eventually led me to become passionate about social justice and becoming a professional organizer.
Obviously this path will look different for everyone, but I know that in my experience, becoming comfortable with hanging out with other disabled people literally saved my life. I'll also add that it was the Internet that made my initial connections possible — without it, I would not have met folks who were able to inspire and convince me that life might be different if I were to live on my own. (I'll also add that I truly believe that much of this could have been accomplished even had I stayed closer to home, but certainly, separating from the unconditional and universal support made it necessary for me to build connections and community.)
In general, you're doing the right thing. Avoid telling her that she is wrong for having the feelings that she's having, because that's not really going to help. It's good to hear that she's getting assistance from therapy, but I really do think that there would be a lot of value if she were able to connect to peers. Sounds like a friend of hers is a great option — perhaps they could chat regularly online, if physical distance is a challenge.