I always viewed that as hew knowing that Vinny has some screws loose and is pretty dangerous. So it's more she knows he might've done something to crazy to you out instead of full concern over you as a person.
Quinn asks Tommy immediately after Tommy mentioned that the MC and Vinny bumped into each other, full of worry and it doesn't matter if the MC fucks with Quinn or not. Quinn knows something about the MC that the MC himself doesn't know yet, and Quinn is afraid of the consequences if something should happen to the MC.
Keyword Priscilla. Priscilla Presley and Memphis Mafia. The Memphis Mafia consisted of friends, associates, employees and cousins. We find in the game several books with Elvis. Elvis died in 1977, in the 70s. Who notices in EP5 that Josy dances like in the 70s? Quinn. Odd only for Jade to mention Josy across from her in EP9 so the sitting pit is 70s retro. Oddly enough, Stephen calls a Priscilla.
Lynette could have been Elvis and Priscilla's daughter, born after he died in 1978. If Lynette delivered the MC at 19-20, the MC would be 19 in 2017, as Maya's calendar indicates.
The MC can play super guitar and, as we learn from Rusty, already has around 100,000 likes on the Rooster video. He pulls the girls' panties off with the music and he can do martial arts. Sounds like a reincarnation of Elvis. Oh yeah, Josy mentioned in EP9 so the MC will have a heart attack much later. Somehow Elvis died of heart failure too.
If really the Memphis Mafia should be behind it and Quinn knows it, it is no wonder that she asks worried, after well-being of the MC.
That would be a great story in any case.