Actually, OP, I think you are the cheeky person in this instance.
You said in your update that she started the buying process first and you later decided you wanted to buy a holiday home in the same area.
When she first chose the house she was buying the one we wanted was not available as someone else was buying it. It then came back on the market and we reserved it *not knowing that she had originally liked it better.*
So she had seen it first and when it came back on the market she decided to go for it.
Also, from your OP, it sounds like it’s going to be her permanent home and just a holiday home to you.
You are definitely the cheeky one in this instance and if I was your friend, I’d be questioning the friendship too.