with a female lead singer
If you like FlyLeaf check out these other female fronted rock bands: Paramore, Evanescense, Lacuna Coil, Garbage, Hole, A Fine Frenzy, No Doubt (first two albums), The Cranberries.
female lead singers- Die Mannequin, Hey Monday, Yeah Yeah Yeahs(love them!!), Paramore, Evanescence, The Runaways, Hole, Sonic Youth, Broken Social Scene
you could also try Eyes Set To Kill, i wouldnt say its exactly like Flyleaf, but theyre worth checking out and in my opinion pretty good.
id say within temptation because its a female fornted band... but its more church choir-y...
Versa Emerge. Porcelain and the tramps. Shiny toy guns. The pretty reckless.
Paramore is pretty similar to Fly leaf. The leads sound a lot alike.
You might like Skillet or Fireflight :)