how do i ask a friend if they still want to be friends?

for context: i dropped out of college last year and moved back home. since i live pretty far from my friends, it’s been hard keeping in contact. there is one friend in particular that i was super close to, but we both suck at texting and calling so we just send memes occasionally. However, she has stopped responding, and when i visited a few weeks ago, we did not hang out. she said she was really busy and that she was sorry we couldn’t hang out. her roommate, and now best friend, and I had a falling out, so I am worried she doesn’t want to be my friend either. this relationship is really important to me, but i just want to know if i should stop worrying and cut my losses or if i need to put in the effort to maintain our friendship. how should i go about texting her? my therapist says i should text her because it would end my worries (whether her response is good or bad). i just have no clue how to ask without sounding stupid.