Interesting approach.
Although what I’d do, if you’re going that direction, is just lower her ammo, but decrease the cost of secondary attacks.
Currently she has 200 ammo, primary fires 20rounds per second, and needs 31 rounds to freeze.
(I.e. 6.45 potential freezes per reload)
Also secondary fire uses 20 ammo.
What if, she had 100 ammo, but secondary fire costs only 10 ammo.
Then she’d only have the potential to freeze 3.22 times per reload.