Depends on whether or not anything she said was good or not. Whether or not it made sense. If it was good, it was probably genuine. If it wasn't, it was probably ingenuine.
Ingenuine = more likely to be attempt to DHV
Genuine = probably just rolling with it. Could be either intential DHV or simply classroom participation. I'd say the frequency is the key here. She could also be attempting to DHV because she wants your attention. Not all DHV's are rooted in rejection
Regardless, mystery has been created. Take a step back and allow it to unroll, jump in when ready. Sounds like she could be a smart cookie though if it's intentional. Beware if you find she's only looking for power.