I definitely would not leave her unattended on a dog runner. I've heard of quite a few deaths by strangulation when unsupervised. If you can afford it, buy a nice 10x10 kennel with a roof to set up outside while you're gone during the day.
Aiden vom HausDaka - IPO3x2, FH, CGC, TT
Carma vom Oz Haus - IPO2, CD