The trick is not to 'kick her outside' just in case, you have to go out with her and wait for her to 'go' give her plenty of praise then go back inside, teach her to pee/poo on command, my 4 dogs all do, I say go wee wee's and they dutifully go and do what they are told to do and if they are being shut inside for the night then I stay outside with them and 9 times out of 10 they will poo as well, I have trained all my dogs to do this, wait until your dog pees outside and just as she performs say 'go wee wee's, good girl', she's a Collie she will learn very quickly, but take her out until you are quite certain that she will perform without you being there, I generally only go out with mine last thing at night as they are all over 2 years old, but on occasion I will reinforce it during the day as well.