She changed her behaviour after I replied yo her ily message?

I've known this girl for a while but timing was never good. You know how it is.
She contacted me after a while yo catch Up and have dinner. We enden Up going for some beers. It was ok.
A little story here. she's been through some.. Disagreements with her parents and her job. Things appsrently calmed down.
Anyway... Out of the blue one morning she texted me ily. I replied with the same. After that she changed. She didn't text first at all. She used to end cinco with "kisses" or xoxo. Now she doesn't.
She then said she was not going out bc of the pandemic. So i said i could go yo her place and just chat outside. So i did. But when i got there she said she was 5 minutes away. I just told her to met me know whe she was there. She never replied (but she was posting on facebook). So intold her i was out there already.
She came out. Her sister came out to say ti and she asked if we where going out (strange since she said she wasn't going out). Anyway.. We started chatting. She even mentioned she didn't know what to do since all of her plans where fallingm. She said she didn't even know if she was going back with her ex. Then she started yawning (hell yeah). So i just said she seemed tires and daid good bye. Gave her some chocolates o had brought her. I told her someone had told me that brand was awesome.. she daid she wills let me know.
So.. Got on my car. She didn't even wait for me to start the dar. She just got inside and thats it. And.. I kinda think that a little message askingif i got home is always a sign. But she didn't do that. she hasn't texted. At all.
So... She changed from texting and trying to go out to... Nothing. So.. I guess i will stop chasing.
Why would que chsnge that much in Duch a short time?
She changed her behaviour after I replied yo her ily message?
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