I have gone through grimoires Tracker.
From today all the way to december 9th, she has only queued with a few people multiple times. A few games with panini, a few games with irene, a few games with avery, a few games with cbui, and ill end listing them there. She only ever duo queues, and not even for every game. Every single person she duo queues with is either an ex-DART player (bunny bee, avery, etc) , or someone she is friends with (panini, cbui, irene, etc)
Most of them are reputable and have VLR pages.
Rarely, she queues with a rando (afaik) for ONE game, which can hardly be called boosting as its not like every one of those rando queues is a win.
Everything i can see shows absolutely NO evidence for getting boosted. No 5 stacks, no weird alts , etc.
I know i went only to december 9th, but thats tens, maybe hundreds of matches, and im not getting paid to go any further.