This will sound snarky, and it's not meant to be- if she is continuing to have accidents, you are not being as diligent as you think you are.
If she goes when she gets back in the house, then that tells me she is unsupervised. You need to crate her or have her immediately near you at all times. Puppies usually give some sort of warning when they are about to go - walking in circles, sniffing the ground, etc. those are your cues to get her outside NOW. Then, the moment she pees, act like she is getting the Nobel and praise, treat RIGHT THEN. Too many people wait until they return to the house to treat, and the message gets lost to a little puppy brain. Reinforcement must be positive and immediate.
If you catch her mid-pee, you simply say "whoops!" and move her outside so she can start to relate that pee=outside. Set her up for success.
All that being said, she's just a baby, and accidents will still happen.