'Fess up and present her with an aerosol of room deodoriser. 
Fatty foods and spices never made me gassy, although I very rarely eat them anyway, but wheat certainly did.
I concur with the charcoal, which no doubt you have by now but also try acidophilus bifidus capsule as they produce the good bacteria which helps stomach, intestine and bowel to cope with the things which are making you gassy. They also balance those innards, helping them to be healthier.
When you get home, try eliminating wheat for a week or 10 days, substitute gluten free if you wish (but be aware that too can make some people gassy and bloated) and see if that makes a difference.
Might be a good idea to keep a food diary for a week or so, particularly of the things you've eaten 5-6 hours before bedtime.
As we age, all our digestive processes work more slowly and a bit inefficiently, like the rest of us, so a little help from a natural remedy or two is always a good thing.