I'm going to ramble here a little bit, but hope it offers some help...
I build true longbows, not three piecers, which are usually RD or recurve. However, due to physical limitations, i specialize in light bows. My max for a bow I'm going to shoot a lot is 30# at my 25" draw. I actually find a bit less better and my go to bows are 23 and 27. I shoot 3D with these all the time.
Among my shooting companions is a couple where the lady is very tiny. One day I was shooting a 17# 66" bow I called Lemonade. She asked to shoot it and fell in love with it. This was a couple of years ago. I ran into them at the range last Sunday and she is still shooting that bow, taking all shots at the same distances as her 6'4" husband.
I think one of the things she likes is that while it's really light poundage, it's a full size bow (at least in length... it's super skinny), so she doesn't feel like she's shooting a kid's bow.
I think you could do much the same thing with a 3 piece build.. a shorter riser and real light but full length limbs... 23-25# maybe. I've built a number of bows in the 25 - 30 range for wives of friends and they do seem to like them. find the right real light weight alum. arrows and they'll shoot just as far and flat as you want. Charlie shoots Easton 1213's in her 17#'er.