maybe she's having this reaction because you are using a mod that changed her idle animations? Judging based on the video you posted she looks like she has an elf idle animation. I'm not entirely sure if that could be the reason though because I use a mod where my character stole her little hand idle pose and Shadowheart now has a normal half-elf tav standing idle but she only talked to scratch & the owlbear I think like 3-4 times the whole game for me.
I'll double check my mods. Thank you.