Is it normal for someone to block me on social media even if we had a good conversation in person?

So there is this girl Vidhi who is too a junior from my MBA campus and is in 1st year of MBA and I freshly completed my MBA. We chatted on Linkedin for a while. But we met in person during my convocation ceremony as she was a volunteer there. She is 23 and I am 24 now turning 25 by the end of this month. She is from Kanpur so she is a full North Indian and I am from Siliguri in West Bengal in India but living in city Bangalore since 2008 and she too came to Bangalore recently for her MBA. So we had a great conversation in person. She was sweet and bubbly and we talked a lot and she was responding and asking me questions too and we had casual handshake.

I said lets keep in touch on Instagram as she isn't that active on Linkedin. But she just shared her Insta ID and said me to follow her and she will follow back. I went home and followed her but she didn't follow me back. I thought maybe she wasn't able to recognize me so i again re-followed her(tried unfollowing and again following her) and send her a dm saying who I am and that we already talked that day but suddenly a few days later she blocked me. Yeah yesterday i noticed I was blocked by her and idk why. We had a great conversation in person and she was being engaging too and she too shared her Insta so why would she suddenly block me?