NOT the bathroom window. Which isn't always open. So she sits on the roof outside and miaows till we open the window.
There is a CAT FLAP!
I put her in the room (utility) where the cat flap is, left some treats on both sides of the flap and shut the door. When I opened the door later, she scarpered having eaten the treats on this side of the flap but not the other side
You might have to tie it open for a bit or hold it open and 'help' her through (not that you have anything better to do...). i had to leave mine propped open as she didn't like the 'feel' of it on her back (poor thing....) i did this for weeks, with a howling gail blowing through the house, then accidently left it shut after she had gone out, and low and behold, she was back in the house later walking aroudn as if nothing had happened. Fucker!! Having said that, i am now holding the front door open for her to go outside and wee and run back in quickly, as the weather is sooooo bad that she can't possibly go round to the back to get in and out
just remembered that my last cat used to knock on the bloody flap with his paw, until we came out of the living room to let him in It used to get louder and louder until the flap was swinging open anyway - no point asking me for advice then, I'd probably end up using it myself and giving the cat a door key...
If I could enter the house by my preferred route I would, and this is what your cat is doing. My eldest cat has struggled with cat flaps, took about 4 months to get her using it and even now she'll try her luck to see if I'll hold it ooen for her. I did lots of cat posting through the flap, standing on the other side and rustling a treat bag, and then giving up and ignoring her. She eventually got it.