[@Unfortunately] I agree with what NK said. You should probably input that up to a certain amount, she can spend time on the ability in order to control and contain it. Though you could also say that the length of time she can spend concentrating could increase as she gains experience. I'd also add that while trying to concentrate, if she is interrupted, it goes back to as if she'd casted it without that time spent, essentially time wasted.

I'd also like to know the probability of the effects of that shield. I just need to know how it will be determined because I may decide to take ownership of that and make rolls for you. So, whenever you want to use it, you will need to contact me for a roll and I will let you know if the shield will work or not.

Also, for the wanted thing, I'm going to try something, with your permission. Whenever she encounters someone I will roll a die type depending on the probability that that person at least knows of her. Most of the students wouldn't even get a roll but people like Maria, Marcus, Jonathan, Criston, or others might get a higher role depending how much of a role they may have played in her imprisonment. Maria will probably get a very high roll because Monty had been coming to Athalia and Maria would have researched her. Whenever she encounters any type of soldier or police authority anywhere in Lavanyan, I'll make a hard roll to decide if they recognize her or not. If they do, they will actively try to detain her. (Plots! :D) 

so, if you're okay with this, then ye. I think it'll be fun. Do some edits to her powers and submit it again and I'll look it over again. She can either meet them on the port they'll be landing in or she'll follow in a smaller boat. The former is probably more likely.