Intentional Feeding

So my long time friend claims she got permabanned for intentionally feeding. I'm not altogether sure about the claim, but as I can't see her screen or dispute this sort of thing, I'm giving her the benefit of the doubt.

Firstly; a bit of background.

My friend has been playing longer than I have. She got me into the game back...I think about the time after Udyr came out? It's been years.

She's an ADC main, and she's pretty good. The problem is she tilts a bit easily. But she doesn't go ranting in the /all chat or even at her team. She just gets vocal in Skype or Discord and doesn't really say anything in team chat. She tends to keep global chat off, and if someone on the team starts getting snarky, she mutes them. So toxic behavior isn't really an issue; she doesn't take it out on her fellow players. If anything, she beats herself up about it. She's a lot better than she likes to think sometimes, but that's just how she is. She's a pessimist.

She's also not the kind to spend a lot of time doing research on the meta. She has a busy work and home life, so typically I'm the one to bring up what is strong/weak in the meta, and the way it's moving. But this current meta has had her sort of...stymied. She hasn't been doing well adjusting to it for whatever reason, and unfortunate (as previously stated) she goes on tilt pretty easily when lane starts falling behind.

Now, when she tilts, she doesn't get violent. She just sort of stops learning from her mistakes and has a tendency to remake them. She usually starts picking up again if her tilt balances out, but lately it's been pretty rough. She's had back-to-back losing streaks, and when she finds a window of success, it doesn't seem to be lasting long this season. Same goes for me really. I tend to play Support, and unfortunate there's only so much you can do. The rest is in the hands of your teammates. I tend to support her when we play together, and admittedly I sometimes get a bit overzealous and over-extend. We both do. But I've never so much as gotten a warning about feeding, or being reported for it. At least, not in recent memory of the last few seasons.

Back to this latest losing streak. In the game she supposed got banned after, she had gone 4/8/2 as Ezreal in bot lane. She was more or less building normally and doing what she could to get some money. While we fought, she stayed mostly bot lane trying to catch back up, and I was trying to keep the bot area warded up so she could do so while I stayed with the team. Before that game, she claimed she had gotten a warning that she had been reported for intentional feeding (the previous game she had played Ashe and her performance was...less than stellar. But she was still building normally and trying). I was convinced she was exaggerating, because she doesn't really go on feeding rampages or the like. But we lost the last game, and she said she got permanently banned.

I won't post her name because that's against board rules, but I am curious. I've posted the recent match history, all the way up to the last game we played last night. I've sent in a support ticket asking if Intentional Feeding punishments work on an algorithm, and if so for a little more insight into it. But I suppose I'll get to the TL;DR

TL;DR Does the above match history, builds (whether sub-optimal or not), picks, and scores seem like something that should or would get someone banned for intentional feeding, or if a ban was placed, should it be disputed? Can one be permanently banned for such a thing without prior punishment? I'd like some insight an opinions. I'm curious what you guys think.

If you have any questions, I can answer them to the best of my ability.