How long did it take for your puppy to fully understand potty training?

I have a four month old Great Dane that came litter trained. I just switched her over to going potty outside before she got too big to fit in her litter tray. This was about two weeks ago. She’s been doing fairly well but still has accidents and only signals to go outside maybe 50% of the time. She does pretty well with going potty outside but has had more poop accidents inside. I understand she is only four months old and accidents are bound to happen but I feel like she should be at least a tiny bit more potty trained. There are also times where I miss her signals to go potty/poop so she will go on the floor and I clean it up silently. She is my first puppy as an adult raising her by myself. (Puppies are way less fun when you’re doing all the work I’ve learned) Any advice on what I can do to make her signal more? Right now she whines a lot when she has to go potty, but she also whines a lot because she’s a big baby, so sometimes it’s hard for me to differentiate her having to go outside, or if she’s just being a baby/bored.