When making a decision like this, I evaluate the calf as a whole-- are they like this with other calves? is she doing this tied or loose? what is her temperment when loose and you are in the same pen? How does she act at feeding time?
My personal opinion after I evaluate all situations and watch the calf some more to determine if this is just a bad behavior or more of a disposition trend- then I seriously look at the feedlot for this animal- especially with heifers- I don't want to have an ill-tempered cow or cow with bad behaviors- she is going to be around for awhile and when they calve- you have to be able to work with them.
I am getting too old and don't have enough time to deal with dangerous behaviors or overall touchy temperments.
That is my philosophy and program at our house. Hope it helps.