Travel from Peru to Austria - what do we need

Dear all,

I am a Hungarian citizen married to a Peruvian wife.
We have lived in Malta for 9 months and we have maltese resident cards. (Just moved back to Hungary for a month)

Her mother is coming to visit us for 10 days. We have the flight booked already and she is coming from Lima to Vienna (changing in Madrid). Then we gonna drive to Hungary.

Peruvians don't need Schengen visa for short stays (90 days in 180 day)

She will have a Schengen insurance and an invitation letter saying that she will stay with my mothers house. (I have my address card for this address too).

We are going to wait for her at the Vienna airport prior her arrival.

What else shall we provide to avoid any issues?

Thanks a lotz

Richard

Any help would be much appreciated