(I love that the site has been up for 48hrs and there are already a gazillion posts...

)
So my txtbk/angel DD is 10 mo old on thurs and is ebf... She's quite small for her age - maybe 16.5 lbs now - and so I think I'm always a bit anxious on the eating front.... anyways - we've been on 4 bfs a day for quite some time now - since 6 mo?... and while she's never been a big eater, every couple days or so recently, her appetite seems to have waned for bfing - either that, or my supply is dropping.. So my question is - how do you know when to drop that mid afternoon bf? Like I said, I'm a bit concerned about her weight gain, so it scares me a bit to drop a bf, but on the other hand - if it'll get her to eat more at the other feeds, then....
This is our EASY:
E/A: 7 a.m. - solids at 8 a.m.
S: 10:30 a.m.
E/A: 11:50 a.m. - solids at 12:30-12:45 p.m.
bf again at 3 p.m.
S: 3:15 p.m.
A: 4:30 p.m. - solids at 4:45 p.m.
bf for bedtime at 7:15 p.m.
S: 7:30 p.m.
Every once in awhile, she'll do a NF, but we've been on a good 3 wk stretch of STTN.... I do the 3rd bf before her nap, because I found that to do it after the nap, with dinner AND the bedtime bf so soon after - she wouldn't eat as much for the bt one...
I know I feel more "full" in the morning and definitely less so in the evening.. so again, I don't know if my supply is dropping and therefore she's eating less, or vice versa. Is this normal, though? What bf will she drop first? And again, how will I know when I/she should? Should I stay at 4 bfs as long as I can? - or will that actually hurt my supply in the long run? I'd definitely like to keep nursing till at least past 1...
TIA!