I thought that was obvious... she'd obviously been constructed from 'human plans' found on the Internet (or wherever) and didn't know the first thing about real life. She was just curious, and, when poking around looking at its neck (which she actually mentions seems too weak to hold up its head) must've exceeded boundaries she didn't know about.
That's not a gratuitous evil scene, that's a gratuitous alien-nature scene of a grotesque stripe. I'm still half-convinced her agenda is different to that of the planet-nuking cylons, too (but only half-convinced), partially because she doesn't look too happy after that scene...