Just had to sneak over to your profile to see pics of Tilly. She has the cutest little face!
Anyway, if you want a play pen and you can't find a "dog" one locally, you could use a "human" one instead. I have a playpen, or ex-pen, that is made for human infants. It does the job very well. If it's just for eating I would use fewer panels, place her food and water in there and allow her time to eat. Always keep water available for her outside the pen. Running and playing can make a pup thirsty.
