I dont care whether its platonic or romantic, though I do find the fact that we've yet to see either of their husbands to be funny(and also the author probably expected people to take it to far because of that)
With that being said, Sharon is the over positivity character whose even overbearing in a way. She's totally the girl who could casually say "Oh Rob, you're the best! I love you" to Rob if he helped her and obviously both parties would know she isnt being serious and their wouldnt be a super big debate analyzing the subtext to see if rob and sharon like each other. And yeah....THIS is the girl who taught gerbera how to socialize.
Its not crazy to think gerbera picked up some of sharon's lingo despite the fact that when she says it, it gives a completely different feel and it does become a bit arguable on whether she means it or not.