Traveling with Platinum spouse - return leg shenanigans

Hi,

My wife (Platinum status) and I are shortly to embark on a week long trip from SFO to PVR. A situation has arisen such that she now has to cut the trip short and abandon the return leg. She will now fly from PVR to LHR, and return to SFO from LHR a few days later.

Are either of us likely to run into any sort of pushback or problems on our respective return legs?

Also, will I lose the benefits of being on the same reservation as a Platinum holder on the return leg if she does not travel with me?

Thanks!