8 month old still having accidents

I've had her for two weeks and take her out every 1.5. Tonight we went out four times, she didn't potty. I put her in her crate for twenty minutes and take her out and she pees. This was at 7. She pooped at 5 so I thought I was in the clear. We come inside and 15 minutes later she poops on the carpet. I didn't catch her so I couldn't correct.

When will she start catching on? Thank you