[quote=@Crimson Flame]
Does consuming a spell slot mean I can’t cast a spell when it’s my turn?
[/quote]

Nope. She can still cast a spell when it's her turn. 

I mentioned it to help keep track. Right now, Ariel has only 2 spell slots for her first level spells. Once those spell slots are used, she won't be able to cast 1st Level Spells until after she takes a Long Rest (which thankfully for her is only 4 hours). After a long rest is completed, the spell slots will be replenished.