Nobody is giving you the other side of the coin so I will :)
THe WHO recommends nursing until at least two and the amount of nutrients in the second year is amazing. I'll have to look up the chart I had found. Why would you want her to eat more food instead of breastmilk? SHe will eat more table food when she wants to. I'm a tandem nursing mom who nursed throughout a pregnancy and in my experience, my oldest night-weaned as I became more pregnant, maybe around 17 months. I don't really remember. My son needed a bit of push to night-wean at about 18 months. Was very gentle and not traumatic at all. Dr. Jay Gordon has a nice sleep method. I found what I was looking for on Kelly mom.
In the second year (12-23 months), 448 mL of breastmilk provides:
29% of energy requirements
43% of protein requirements
36% of calcium requirements
75% of vitamin A requirements
76% of folate requirements
94% of vitamin B12 requirements
60% of vitamin C requirements
-- Dewey 2001
ANd that's only like 15 oz I think. If your daughter is getting more than that, just think how much she is thriving. If it were me, I would just get through one more winter so she is as healthy as she can be through flu season being so young. If you want any more advice or someone to talk to who has been there (and survived!) you can message me. I know it seems like you should wean at a year because that's what everyone does but it is far healthier physically and emotionally to let her nurse til she is ready to wean.
I got a period when my daughter was 10 months old and then very sporadically and was pregnant when she was 14 months old. You may be ovulating and just not know it.