I am in a sort of similar situation don't get me wrong, love my house, but it's ancient there's s o much work, money and time it needs, like your friend I'd need to knock down the wall to extend the kitchen. In my case I have no funds. Yeah my dream house is the same, massive detached situation
But the reality is I'm lucky I was able to afford this one. I'd lose money even if I thought of selling this house now even if it meant going on a chain, because of all the money and work we put in, from stamp duty to furniture to decor bits, so it makes absolutely no sense to sell up.
In my case I'm just going to have to suck it up and live here for the next five years, and try to save and improve upon what I already have.
Buying a house can't be taken lightly in the sense you can't just up and quit even if you wanted to, because of everything that goes into the purchase in the first place...
Could ask your friend to focus on what's good in the house, and 3 of the issues that bug her the most that she can at least try fix, eg talk to the neighbors or install soundproofing/ etc
hope this helps