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Yes, this sentence is very similar to the examples we've already discussed in tocha's threads:
У нее был друг.
У Наташи было два сына.
etc.

You can't analyse Russian sentence relying on the...

Или "У нее не было русских друзей". :)

"У нее были русские друзья" is correct.

Она была в Лондоне.

Could you please say in English what this sentence is supposed to mean? I'm afraid in Russian it has no sense - it lacks a subject.
For example, you can fix it like this:
У неё была подруга в...

"У нее был русский друг" is correct.
Друг (что делал?) - был.

(Аgain, the same type of sentence as with Natasha's sons. "Друг" is a subject, "был" is a predicate, "у нее" is an object.
Sorry,...