[@Virgil] Haha. I've seen modern composite recurves of the high-poundage-variety, but longbows have a much better poundage range. A hundred pounder would definitely not be a lot in the middle ages, and speaking from personal experience, with the types of arrows necessary for them (insane amount of fletching, INSANELY heavy bodkin points, and tapered for better flight) you could definitely make a human explode given the right angle/distance. I know there's actually a modern English longbowman who shoots 185 or something insane like that, out in the UK.  My best friend actually shoots a 110lb longbow, and it's incredibly taxing on the muscles. He can only pull about 3 arrows an end. There's basically no aiming (at least, no incredible precision, especially with moving targets) with longbows of that poundage because they will literally explode/shatter if they're kept open longer than ten or so seconds - the wood doesn't want to move. I personally shoot a 50 lb barebow (though I'd love to move up and shoot a 75lb longbow), and it's pretty excellent in terms of precision and not exploding. 

Anyways, I actually misread the OP and in my head mixed up the ragtaggedness of Anthem with the opposing forces. As such, I thought that a 65 lb longbow would suffice in penetrating what little plate (great to dent with arrows! Good for concussions) and more specifically, leather armor, any opposing forces had. So thanks for pointing that out! I think that 85-90 lbs would be more appropriate, while still being realistic as to what a female elf could reasonably pull. Anything over 95 lbs would really being pushing it, I think. 

Thanks for the bow-talk! I love meeting people who like weaponry.