I am not sure if you are addressing me, violets.
History often requires higher grades of A levels than MFL. At Oxford and at a few other universities they will want AAA for MFL. The other issue is the number of applicants for History are far greater than those for MFL. This makes it, statistically, more challenging to get a place. Less students take MFL at A level. Even fewer take 2 MFL at A level. Also with MFL you can sometimes add another MFL at university if you do not currently study it. This makes it joint honours.
Durham do separate languages! They do French Studies, German Studies, Hispanic Studies and so on. They also do European MFL and History. Have a look at the MFL Dept on their web site for undergraduate courses.
If she is a very strong candidate, she should apply for what she actually wants to study. All I am saying is that less people apply for MFL so there is a higher chance of being accepted but for brilliant people this does not matter of course. They will get a place anyway.
English is not considered a MFL at university and is not part of an MFL Dept. You can often combine it with a language and that will be competitive too. However, as language departments really want strong candidates, they like people who apply for joint honours including a language, so adding in a language is a really good thing.