How do you say this in French, please?: "she could have had"

I think it's "elle aurait pu avoir", this is the conditional past. It's tricky to form this tense when you're using pouvoir, devoir etc.

Here are some of my own examples, seeing these might help you understand the pattern:

J'aurais du(circumflex on the u) manger = I should have eaten
Il aurait pu voir = He could have seen
Ils auront vu = They would have seen

(sorry if this isn't correct)

Thanks Gemma.

In the second example "They would have seen" I would write "Ils auraient vu"
If we write "Ils auront vu" we are expressing "They will have seen"
I agree with Gemma that the grammar is indeed tricky.

elle peut a eu

Elle aurait pu avoir