A girl messaged after not responding to a message 4 months ago, and apologized and explained what was going on, is she interested?

Prolificvisions
About 4 days before my college closed down and went remote, this girl randomly sat next to me, mid-semester, and started conversing with me. We talked everyday before class. I got her number and we talked for a while, and it was really engaging, but then she moved back to Florida with her parent. We responded a bit after that, and then in May she just didn't respond.

Well, an hour ago she messaged me out of no where and apologized for not responding back and said she had some things going on and asked how I was. I responded with a joke, and asked how she was and what classes she's taking, and she responded with a long message. This went back and forth for about 30 minutes, each message longer than the last, from her. She then told me she responds better on instagram, and asked for my username. After that she said "it was nice catching up with you. Take Care! Have a a nice night."

Her responses were filled with smiley faces and expiration marks and really outgoing messages.
Her abrupt response about catching up is whats throwing me off. Was this all just because she felt bad? Why respond after 4 months? Does Her last message imply she doesn't want to talk any further? Why did she ask for my Instagram and say she responds faster?
A girl messaged after not responding to a message 4 months ago, and apologized and explained what was going on, is she interested?
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