I wish the event was tiered. Such that at 3* you have access to a tier that will drop 8 shards a play with one refresh available - allowing you to move her from 3* to 4* in two months if you refresh the event. Then at 4* you'd unlock a new tier that drops 16 shards, allowing you to again push 4 stars to 5 in two months with refreshes. And so forth and so on.
This would make the event let you max her in eight months with refreshes, and only if you are actually building MT and her team.