Just how many shards do you think you will need to have her max?
One day the most you can have is 3*5 and one randomly 2-7, so average is 20 per day. The event will run around 14 days so the max shards you can have around 280, that many only enough to make her 4 stars. And not to count how many stamina you will need to farm everyday, it will cost around 2.600 staminas per day, and one day with all the free bonus you will have 528 staminas. The 2.100 staminas lacking there where will you get? You can only buy in shop 600 staminas max by paying 250 ruby everyday.