OK, it's just I think some of that stuff was perfectly natural for her.
We see her among the other squabbling grownups when grandpa calls for reason in LBT 3.
So what? Adults
will argue! The fact that Grandpa wasn't annoys me, because I think it's wrong to portray him and Grandma as perfect while the rest are normal.
We see her looking rather intimidated at the tale about the land of mists in LBT 4.
So what? If I read a story about the weather changing somewhere, it would be natural to be intimidated. As for the grandparents not being, see above. (By the way, I'm not sure it is her---for reference check the pic I posted above.)
And unless memory is cheating me as I have seen the movie only two times and a while ago too she was very ready to participate in Mr. Threehorn's witchhunt in LBT 11.
She did, but did she have any idea what the creepy crawlies were? Her son did as well, even getting a singing part about it, I might point out. So did everyone else in the valley except Littlefoot, who knew the truth about the treesweets' disapearence, and...yeah, you guessed it, the freakin' perfect grandparents.
All I'm saying is she's normal and doesn't deserved to be portrayed in a negative light for being so.