Even if one were to grant that her decision to destroy the array got them stranded there, there were plenty of subsequent opportunities to get her crew home.
I would contend that, more than one poor decision, it was her refusal to accept other offers that resulted in them being stuck in the Delta Quadrant for as long as they did.
If she just gave Q that damn baby he wanted, or returned that suicidal Q to the continuum for punishment, he could have snapped them all back home.
She could have, at the very least, asked if there was some kind of arrangement they could have made. It's just plain negligent on her part not to at least ask.
All their attempts to get home faster had to fail, that's the "Gilligan Syndrome" the show suffered from.