Denied overseas interview - what now?

That's just a (very expensive: £4,395 !) summer school and is not directly affiliated to Cambridge University. It would not be relevant for the OP's circumstances, and certainly wouldn't help them get an interview...

If it's not this one, do you have other "options" you can link to?

My sincere apologies if you find it way expensive for your taste. I was simply letting her see that there are options such as a third party organization or platform which could help reach her goal. I'm deeply sorry if it was such a bother to you.

My sincere apologies if you find it way expensive for your taste. I was simply letting her see that there are options such as a third party organization or platform which could help reach her goal. I'm deeply sorry if it was such a bother to you.

How could attending a summer school help gain admission as an undergraduate to Cambridge? The school is merely renting space from the university and the fact of attendance will play no part in an application.