Well, if she is under the weather, I might suggest some alone time with her. Plan a movie at home, but first, you have to set the mood.
Make dinner, nothing fancy, something she likes and easy to clean up afterwards.
Offer her a hot sponge bath with aroma candles.
Turn the lights down, plop onto the sofa with a big bowl of popcorn, a big blanket, and a movie that you both like. Well, mainly what she likes. It is her b-day. You may even have to get a chick flick for her.
It worked for me a couple times. Saved me from the doghouse.
1997 Pontiac Bonneville SEi-SCRAPYARD
2000 Chevrolet Blazer LT 4X4 4.3L
2002 Chevrolet *-10 LS Ext Cab 4X4 5.7 V8