That is pure stupidity. What if she got in the way of the police getting a clear shot? What if she got her kids killed? It was a selfish act that turned out OK but who knows what damage might have been done or how many might have been killed?
“What if she got in the way of the police getting a clear shot?”
If the police were inside, doing their job (leading), then she needn’t go in. Otherwise, they should put their badges and guns on the ground and crawl away.
There is no “waiting for backup” when people are being sacrificed inside.