Met someone online, had intense conversations for a week, including future plans, then she became distant after we met in person

I recently met a girl like 10 days ago. She posted online about wanting people to go to a concert and I replied. We realized we have everything in common and been having long deep conversations since day 1. we just reply like once or twice a day but replies of over +30 messages (sometimes even around 80-100 between messages, pics , links and sending songs). she is extremely sweet with me (for example, she is older and said her age is a fucked up one and I was like "really? dont tell me that" and she replied "i hope Im still im your life to protect you from it" or I said once "sorry for texting too much" and she said I fixed her week and feels very relaxed talking with me cause I understand her so well.) She also compliments me a lot (I love talking to you, you are so inteligent, you are adorable etc") , and I do sometimes too. We also talked about future plans like attending specific concerts together, or she said she wanted to do a specific trip one day, I said I do too and she said "We need to get along well to go together!!". I know she is a HSP, I dont know how related to it it is.

We met for the first time in person for the concert last friday with two friends of her and a few randoms who joined us and she was very "normal" not specially sweet or fixating in me for talking (I would say she mostly talked to her two friends, less to me, and less to the randoms than me, but she talked to everyone.) she huged me to say hi and bye and one time in the concert. Our fav song of the artist is the same , and before it started I said "here we go" and she huged me and we listened to it together in silence. when it finished, she asked how was it and I huged her.

We chatted a bit after the concert to send pics and talk about it and said she will repply my long texts next day. she didnt and at 11pm she texted me to say "sorry i didnt , I needed to spend the day alone as Im still exhausted from yesterday, will repply tomorrow"I told her its okay, I was a lil confused but imagined it was smth like that and to dont worry. next day around mid day she replied everything ,and about me being confused she told me I shouldnt be , she sometimes takes a while to reply if she doesnt have the time or energy and her friends end up used to that. She said in one of our conversations she prefers more 1 to 1 hangouts with friends rather than groups or texting and loves to spend time alone , needing time to reload her social battery after hanging out, so it fits what she says

Since she replied to my last long message two and a half days ago, she hasnt replied back or even watched my insta stories. I sent her a meme I knew she would like yesterday and she replied quickly to it but totally ignored the rest of messages and didnt even say she will read it later, something she used to do. This days Ive seen her posting and replying to her friends on social media (not in the one we talk though)

what do you think of this situation? has she changed her attitude about me since we met in person or Im reading too much? I just find shocking she used to text me so much and so intensely to randomly drop conversation with no aparent reason

Also, my main idea (and probably hers) is being friends. I see her as someone I can have more than that after a while if we both feel comfortable with it, but I want to be friends at least