I [25M] told my coworker [25F] I wanted to sleep on the train and not talk. She's now distant.

I'm a pretty introverted person and I have a 1 hour commute on the train every day. I use that time to read, nap or decompress with my headphones in.
My coworker who joined us 2 montha ago now catches the same train line as me and at the same time too.
For about week it was horrible because I saw her before work, after work and during work because she wanted to leave together too and she makes a lot of small talk.
I finally told her that train time was my time to decompress and I didn't really like talking or interaction with anyone on the train. I emphasized that this was with everyone and not just her and even apologised.
She was taken aback but said she understood and she either sits in another carriage or something because I haven't seen her on the train since.
If we leave at the same time, she goes to the bathroom first.
But she now pretty much avoids me all together. If we are exiting the station she just walks slower. If I try to make small talk in the office she shuts me down. We are sitting next to each other for a project and apart from good morning and stuff about work we don't talk.
When I asked her to cover a piece of work for me because I needed to leave early for an appointment she said she couldn't but does for other coworkers. If I compliment her work, all she says is "thanks" really bluntly but she's all bubbly with other coworkers.
People now think I have insulted or was rude to her because she's so extroverted and organizes social stuff at work already and when anyone's asked her she keeps saying it's nothing and she doesn't want to get into it.
Now my coworkers are being a bit cooler towards me as well. How do I handle this going forward?
TLDR: Told coworker I don't like to talk on the train. Now she's being super cold towards me.


Source.