First, not neutering a cat is animal cruelty or it will unavoidably lead to animal cruelty.
Second, not only male cats have territory, in a lesser sense, also the females have.
Third, she doesn't know that peeing on the kitten litter is a requirement, because you can't explain it to her. She used it only because always this had already a pee odor. She doesn't know, why would be any problem with changing this place to another location.
- She need to understand, where is the toilet. For a while, don't clean it after all usage, do it only after all second.
- Be careful, while on toilet, and after a while, exclusively positive experiences should happen to she!
- If you find her pee/faeces elsewhere, take him to that place and move her nose to "that". Don't touch it, it would be cruel, but it is important to feel the odor more strongly as she would like it. "Explain" here that you are now very angry. Push her down (don't cause pain! But you can make it unpleasant), give threatening voices, while you still hold her.
- If you see that she needs to use the toilet, move she to the litter and give her many love, until she doesn't do her "task". The thinking of the cats is very location-oriented. If you move she to any place, she understands very well, that you want she to be on that place. They see no reason to follow your wishes too long, but they understand it. If you move she to the litter while see needs to pee, she will understand very well: you want she too pee on the litter.
- Any time after she uses the ordinary toilet, give she many love. (Don't touch or even near she while she is on it!)
So it will work, don't worry, I had never cats who hadn't understood already the first "lesson" very well. I've seen on them. First, they simply don't want to pee (s*) for a while. After they can't hold it any more, they start to think, what to do. They are looking for a place to pee, and they are looking to you. It is visible on them, as they learn: peeing on the cat litter didn't lead to a bad event with you. Only peeing next to the bed. And they go to the cat litter.
The important thing is: they don't understand, why is it important for you. They don't think in "why"s. To them, peeing beside the bed would be okay, they can't see any bad in it.
But, honestly, already 3-4 week old kitten use the toilet from themselves, and they learn - from the odor - where is the place where they have to pee (s*).