I agree with
@Tamerlane on this. It seems people don't understand that love isn't always in a romantic vein. Gerbera just cherishes her friendship with Sharon that much, even if they do it in secret from the prying eyes of everyone's in their lives (but I bet many might know about their secrecy). I don't know why every relationship "needs" to be a ship. You can get a better grasp of Gerbera's situation if you put yourself in her shoes, she was raised as an only child, had a strict education by their parents, and wasn't allowed to make friends throughout her schools days, and past that, she was engaged to her to be husband probably from an early age (7-8 years), she had 3 children before 24, and so on. That's a lot of pressure on a young mind, making it hard not to fuck her education and psych at some point, in the case in question, her socialization skills.
I don't know why you lot need to jump the gun here. I'm not saying it can't be a Yuri relationship, but it's highly likely this might not be the case. Gerbera had a difficult life as a noble kid, so I'm just glad she found a good friend and confidant to relieve her worries, especially when one of her kids is cursed and her husband is gravely ill haha.