I would upset and offended if a friend did not invite my dh to ther wedding.

when we got marrried we invited all partners if they were married, enagegd or in a long term relationship even if we didn t know them as we both had friends from work who we had not met partners before. We didnt invite people with new partners (eg less than 6 months) that we didnt know.

I prob wouldnt go myself as i think it is rude of her but depends if u want to go or not alone