Okay, there are 4 I's, 6 T's, and 1 R.

It's -- --i--i-e--e t-at -a-'s -est -rie-- -a---t ta--.

sammi - E(4) = 8
jackiesdaisy1935 - S(3) + T(6)= 9
Logan - A(4) = 8
Karen - I(4) = 8
Rottie - R(1) = 1

Letters left to choose from:
BCDFGHJKLMNOPQUVWXYZ