Is she a toxic friend?

When she invites me to hang out or go on holiday, if I don't make a decision fast enough, she bails altogether and says she's already busy. She isn't the first person I invite to certain events because we enjoy different things, yet she'll still act jealous when I don't tell her about it.

She didn't seem to understand why I chose to visit other people first when lockdown eased, even though I hadn't seen them in much longer and they live much further away. I offer her free weekends, but she never acts upon them.

I struggle to comfort people when they're in tough situations; this is no different when she opens up to me about her anxieties, but lately our conversations die before there's a conclusion. She's asking for my advice but ignoring any I attempt to give.

I constantly have to reassure her that my other friends don't hate her. She gets on with them, but she refuses to label her relationships with them as more than an acquaintance. I get that's not a me problem, but the attitude makes me feel like a middleman and guilty for prioritizing certain people over her.