So I’m not as far ahead as you when it comes to her, since I’m only at TL 87. My Alice is only at 2 stars (I opened 100+ diamond crates saved up from contests), she’s lvl 86 and P4. I’ve been investing as much as I could on her as often as I can, and while I’m no where near her full potential, it’s easy to theory craft her now that I’ve given her lots to work with. (Theory-crafting is fun for me :D)
So anyways, Alice is more like an off-Support hero. Her Flood of Tears and Tantrum while in regular size allows her to provide some very useful utilities for her team. But when she goes enormous, that’s when she betrays her “Support” role, and becomes an off-Tank instead. In theory, her friendship Disks allow you to focus on her supportive potential or her offensive potential. With PvP in mind, I think her disk with Quorra is preferred because she can provide shields when she grows Enormous. But I think her disk with Miguel is better on attack (increases damage done when enormous). In other modes, which disk to use I think starts to depend more on who else she’s teamed up with.
In non-PvP modes, she works very well with characters who greatly reap the full potential of her speed-modifiers. For example, she works exceptionally well with Elsa, who pumps out more damage against slowed targets. Her slows also stack with Olaf’s passive. Characters with naturally slow attacks like Jack Skellington experience a boost in usefulness when paired with her. Using her for her utilities work exceptionally well in modes where you can turn auto-mode off, so you can keep her from becoming Enormous. Quorra’s Disk is more useful in these cases when your intention is to use Alice for making her team perform better.
In contrast, her supportive moves are rather redundant when paired with characters who focus on Stuns, like Maleficent and Gaston. In such cases, she’s better off becoming Enormous as soon as possible, which is where Miguel’s disk really starts to shine. Hyper-offense teams should be more inclined to make frequent use of her regular size though, since becoming enormous should only be used as a way to keep Alice herself alive.
Anyways, I’m sorry this was elaborate, but I really did want to cover as much as I can with what I learned.