am i overreacting?

Lately, my friend has been leaving me on seen when I first talked to her about it she gave a reply that felt kinda hurtful *maybe bc I'm overly sensitive and can't read on to social cues* I said "Hey rocki, did I do something wrong? You usually don't leave me on seen, and I wanna know if I read the situation wrong because I'm confused if I did/said something wrong. I'm sorry I don't do/say things with bad intent. I'm sorry if I'm clingy or overreacting. I just get scared easily, and I don't wanna do wrong by anyone, and I really value our friendship and don't want to lose it :( i tend to read into things too much so if I am overreacting I'm sorry I just care about our friendship a lot and don't want to do anything to ruin it"

 she said "Girl I have not internet at school  usually if I don’t respond, A. I’m lazy B. I don’t have internet or C. I can’t bc I’m in an important setting, " but one time she FaceTimed me at her school, and why would she be on tiktok at an important setting? If she was lazy, I feel like she should've said "Hey I don't feel like replying to this right now, but I will later" to reassure me bc I thought I did something wrong now she leaves me on seen a bunch and sometimes replys to the videos I send her without reading my messages along with them and I thought she was getting better bc she was excited that 2020 was back and I was happy that she was happy so I joined in with her and we talked for a while.

 Then she sent me a post on Instagram that said "when they send you too much videos to the point it feels like a job to answer them" and i sent  "You can always do it later <3 just tell me so I won't get confused :]" and "Communication is key with me lol" and she said "ik" I want her to feel like she can talk to me about stuff and if I was making her feel overwhelmed with the videos I sent her she could've told me and I would stop

 but the thing is that she also sends me a bunch of videos and I always respond when I'm online because I don't want her to feel ignored bc I know how much it hurts and when I repost stuff I can see she liked it so I know she's online but she just won't tell me she'd reply to the videos later.

 I'm just really confused because she sends me a bunch of stuff, and I do the same bc I want to talk to her, and she was my friend during dark times of my life. I feel like if I wanted to respond to her messages later, I would tell her so she'd know that I wasn't ignoring her I was just tired, I just don't know why she doesn't do the same for me bc she knows I can overthink and it's better to reassure me.

 My sister doesn't like her and says she isn't good enough to be friends with me *rocki made fun of my looks ruining more of my self image bc i had insecurities and this was during a dark time of my life when I wanted to kms* but that was ages ago. Am I overreacting? Do i let her go? I feel stuck bc she was my friend for a long time :[

*edit i forgot to add that she is dry with me now*