Welcome to BP.net first off!
BP's yawn mostly to realign their jaw but it isn't often, and because you are hearing 'hissing' sounds this does sound like the start of an RI. If you see any liquid around her mouth I would contact a Herp vet. But for keep a close eye on her and make sure your temperatures and humidity are spot on. (50-60% humidity, 90-93 warm side, 80-83 cool side)
Kitchen scales are good. You can get them for a decent price at Walmart or any other super store. Just make sure you look at its maximum limit.
2 mice a week seem a little small for an adult female BP. When you get your scale weigh her and see what she needs to be eating every week. I feed my 2400 gram girl a medium rat every 7 days.
Good luck!
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