Q: Battery light on, don't have power steering in D but have in R, AC not cold, white smoke ? other day smelled sweet.

The other day when it was -15F I started my car, started to back out of spot, and it died in R. Figured it was battery from cold, so put in N and pushed back in. Next day tried to start, struggled to start but did, then white sweet smelling smoke came out of hood and battery light came on. Turned off. Started again 10min later, no smoke, no light - needed to move car 40ft so backed out, all fine, then put in D and lost power steering. Put back in R, had power steer again. Put in my driveway. Turned on a few times over past week just to see if it started, smoked, light came on, etc. and everything looked good.

Added more antifreeze this morning (now 50F outside) because it was a little low (but not much), started car, and again fine - no light, no smoke. Backed down driveway to test steering, had it in R, put in D and lost power steering then battery light came on. Pulled back into driveway and left it. Wrote this question.

Also, my AC hasn't been cold for about 3 years

My car has 109000 miles.
My car has an automatic transmission.