I have a few thoughts on this:

I thought both Danielle and Lindsay were communicating in their own way, fighting like sisters rather than friends. I think Lindsay thought so too, especially given the cheeky kiss and hug at the end. I think that would have been a possibility of them reconciling if Danielle wasn't pushed towards a certain direction by the other girls.

Let's be real, if you are vulnerable and feeling alone, and people keep telling you that you are being victimised, you would get angrier and wouldn't compromise at all. The girls are offering her comfort and friendship, so naturally there's this element of warmth being emanated there which is what her vulnerability needed in that minute. I'm not saying that the girls exploited vulnerability but I'm saying that Paige's "This validates everything we've ever said about Lindsay" is clear they knew what they were doing and used that vulnerability for personal gain.

Danielle thinks that bringing something up in a group setting is a way to protect herself from that 'monster' victimising her. She's not seeing things in the way Lindsay is seeing them at all. Things have been very blown up in her head, and Lindsay isn't understanding that something that could've been a proactive discussion around "hey I feel alone and this is happening in my life while you haven't been around" is actually now "you're never there for me, you make me feel insignificant"

It's a) catastrophising, and b) intherapy, a key element of healthy relationships is the ability to mentalise and know the limits of what people can know about others' mental states. You can't rely on people to read between the lines because sometimes, even without malice, we get busy and assume others are okay. Until you say something, it's unfair and unhealthy to blame the other person for not knowing it.

Lindsay on the other hand has noticed Danielle has been coming for her, before they've even had a discussion about why Danielle is so upset. Lindsay has already been dealing with conflict with Mya and Amanda one on one, and now it feels like her best friend is coming into the mix too out of nowhere. Lindsay has been leaving the house early due to attacks on her by people like Kyle too, and hasn't managed to actually be in there long enough to figure out that Danielle feels more and more hurt by her leaving each weekend. Danielle calling her out for weird things in front of the group and talking about her relationship to the group, was spiteful and indefensible.

I feel for Danielle and I think she's valid in her pain, but I struggle to support her because she's handling it by hurting others more. At this point, Lindsay has every reason to walk away from this friendship, because she's not being clued on to what is going on despite the opportunities Danielle has had. It feels like Danielle is purposefully not telling her, so that she can be validated in the anger that has now been brewing and because she knows she has support from the girls for it.