BUT, she stopped taking BC overall which makes me a little worried because we had sex toward the end of her period I ejaculated inside of her once.
Since she decided to stop taking BC after her placebo week is she still in the risk of becoming pregnant?
Sperm can survive up to 5 days but usually only survive 2 days. So as long as she took her pill when she was supposed to and takes it regularly it is unlikely she get pregnant. BC is not 100% so if you're that worried you should consider using condoms too. This will help decrease the chance of pregnancy AND protect you from disease.
We had sex towards the end of her period basically, just right before she was supposed to take her new pack of pills.
She could get pregnant, but it depends on on whether she's had her period or not. There is a 1 week slot in a month that a woman can get pregnant, all the other times they can't. If you had sex within this 1 week, then she could get pregnant, but if you didn't she may not.