no verbal declaration, whats the rule?

[houstonCT]

home game. folds to SB, SB completes(400-800 blinds), BB makes it 3000 straight, SB immediately comes back all in for 13,100(not including the 3000 BB raise), so the raise is 10,100. BB thinks for a bit and throws in two blues(1000/e) and a white(100/e) thinking she has made the call. dealer lets her know she is short. She thought the blues were 5000 and decides she doesnt want to call. She never announced call, just threw the incorrect chips in.

it was ruled she could fold, but the 2100 stays in the pot.

was that correct?

she knew damn well that she had every intention of calling, but when she realized her stack wasnt what she thought it was, realized she didnt want to risk the chips.

but she never verballized anything.