Oh no! Hopefully it's one that had passed that she scavenged... I have shrimp in a tank with mollies, but they're generally "culls", only a few more brightly coloured, lots of clear and wild type ones, so I wouldn't necessarily notice if the odd one got picked off.
I know mollies will eat anything, greedily and happily, but generally I'd expect a live shrimp to be able to leap away before she could grab one, unless she caught one by luck.
Beautiful molly! Even if she is a naughty girl!