Ya from what Ive seen of their videos, it doesnt seem like Amber Lynn really likes Destiny at all. There was one video where I think Destiny was trying to spoon her, or kiss her, and yeah it was a bad moment, but Amber Lynn looked at her and said something like, "Why are you doing that?" in a deadpan, very annoyed tone of voice.
I mean Amber Lynn seems like the type of girl you stay away from in general just because she seems like the type of person who's always on the lookout for something/someone "better".
She seems very fake all things considered-- but above and beyond her tendency to always be on the lookout for a new opportunity, I think she kind of finds Destiny annoying. Like, even Amber Lynn thinks she's "slow", and probably cant relate to her. That's why she buys tons of gifts and put it on the internet, because she wants to show "how much she loves other people" without having to actually commit to them.
In her videos, it's never "we did this'; it's always "I did this, I bought this, I ate this, I'm doing this," and usually that means Destiny tagged along because I dont get the feeling that she has too many other people or things in her life but I always get the vibe that Amber Lynn is the "star".
If Destiny shows up in a video, it's because Destiny happened to be there and accidentally was in the way when Amber Lynn turns around, or because it's a video specifically about how great Amber Lynn is for being good to Destiny (the gifts video), or Destiny is doing something weird and kind of forces her way into the video and forces Amber Lynn to acknowledge her.
But it's never like, "Woo! Destiny had the day off so she and I went to the zoo and Destiny loooved the penguins they did such and such!" Or "Hey it's Saturday so I decided to go to the park and now I'm vlogging because I asked if Destiny wanted to go and we had SO MUCH FUN playing games outside! Or watching a movie! Or at a picnic!" it always seems like, "Im out with my friends, Im doing what I want to do, Im at Golden Corral, we're hanging out gossiping about the new Wendys menu items. Oh, also Destiny is here; she's driving us, say hi Destiny!!!!"
It's her channel and her videos, so they are always biased, but from what I've seen of her relationships, they always feel like they are run on either her terms or nothing; it's not equal, it's not a partnership, there's no concession, if mamma aint happy aint nobody happy. It's a very vague unease I get, watching their relationship, because Destiny seems like the type of person who is very clingy, and will put up with abuse or shitty relationships just because she's getting attention or validation--she's "slow" and kind of simple so you dont really know anything is off in their relationship because her baseline is so off.
TL;DR: I could be off, but it seems to me that Amber Lynn is merely "putting up with" Destiny, and sees her as a free ride, not only to mooch off of for money and affection but in this case, literally, since Amber Lynn apparently can't drive.