Have to agree with George here...just becasue she yelps, does not mean she's hurting.
Nixon is a Drama King, and will yelp over nothing.
Our Ruby also tends to reist going out for last potty.
I'm sure she'd never go out at all, except for the boys are always willing and she will usually tag along with them.
However, if its cold or wet out, I often have to physically shove her butt out the door.
So...Leash your girl up and make her get up and go out.
No treats until she's done her business an back inside. Use the best treats you've got.