Going to address these at once, so here goes.
Maya does not seem to come across as envious of Josy. When she sees Josy and her Dad reconcile with each other it wounds Maya because of the strained relationship with her Dad. She has a longing for such a thing with her own Dad as I get the sense that she was probably quite close to him, like he was her rock throughout most of her life but then when he found out about her, that bond was shattered and she yearns to repair it because she probably views those times through rose-tinted glasses and sees them as mostly good. This longing for reconciliation with her Dad would only be envy if she resented Josy for what she has with her Dad, but she doesn't resent Josy as she says that she is happy for her.
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With regards to her being "weak" because she relies on other people, some people are just like that where there is often a person or people in their life they view as being their "rock", the one(s)who keep them grounded, who are there for them in times of need, and who, generally, don't judge them too harshly and support them. To put such trust in another person is a sign of great strength, not weakness, because you're opening yourself up to them and trusting, hoping that they will accept you for you, taking that brave step to face possible rejection by putting yourself out there. People who don't put such trust in others, who try to be this lone wolf that doesn't need anyone, are more often the weak ones because they're scared to let others in and thus keep everybody at arms length which can lead to them being very lonely people.
Maya simply feels like the world is against her which is a sign that she views herself as the problem, as though being who she is is why so many things are, in her words, "unfair". She doesn't seem to have great sense of self-worth which could be another reason why she attaches herself to others as they give her a feeling of being worthy. Now that she's in college she'll hopefully gain more confidence as most people do, but there's nothing that's really wrong with her right now, she just needs to find herself and now she has the chance to do so, away from her controlling parents.
Her Dad issued her an "ultimatum" and is using this to withhold her tuition, and he is the one that was keeping Maya from seeing Josy for some time now. His visit to Maya's dorm was most likely to pressure her to accept this ultimatum and she either refused or didn't give an answer which is what made her more determined to join the HOTs for the "free tuition" so that she wouldn't have to accept or refuse his ultimatum.
So Maya was not the cause of her relationship with Josy breaking down, it was her Dad and he is still an obstacle in their way.