
When our girls came into season, given we had entires (males and females) until retired from show/maternal duties, they were moved upstairs (with their crate open inside our ex-pen and a thick cover on the floor) and taken out to empty in the front garden - at the time, most of the places we lived in were very rural and I always went with them - so the only crossing place was the foot of the stairs which had to be wiped after each outing.
None of our in-season girls went out off our properties during their seasons. No way would I risk leaving a trail from the door for any (rarely) loose male to pick up. To be kind to any local entire males, it would be kinder, if you have to take her off your property at all, to take her off in your car to a quiet area - but keep her on the lead, obviously. And I have a theory about how we managed never to have a Pyo with all the bitches we had over the years.... they never went off our property to risk squatting in the wrong place, when wide open. And they were NEVER outside without me being right there, with a lead to hand.
I'd NEVER use dog pants - for the simple reason no owner would be able to change them often enough for this to be hygienic. The discharge needs to come away, not be held against her. And many 'puppies' would rip them off, chewing them and risking choking.
If you have children, you MUST be sure they don't let her out on her own, accidentally! To be honest, why not plan to get her spayed? As she's in season now, plan on having this done in roughly 2 months time - if nothing else, so you don't have to confine her for 3 weeks, twice a year.