Maya wasn't envious of Josy, she was just upset. I've likened this before to someone losing a parent/loved one; they're dealing with their grief at the loss of that relationship as best they can, but when they see someone else, be they a friend, partner, stranger, enjoying a nice moment with a similar person to that which the grieving person has lost, well then they're going to feel sad about that and need a moment alone to deal with their feelings. This, to me, is what happened with Maya; she's somewhat "lost" her Dad because if he did love her before, he doesn't now because of her relationship and she feels like she'll never have a moment with him again like what Josy just had with her Dad, so it gets her upset over that loss of her Dad's love.