L.C.
Well, first off: stop listening to people who have solutions for aspects of your life that are not problems. She was sleeping fine, but everyone (not *everyone* cause I can guarantee it wasn't me!) tells you 'break it, quick' and you responded out of confusion and probably some desire to please others. Now you have a child who doesn't sleep as well as she used to. Perfect. Now I recommend that you get all those 'everyones' to come over and take a turn of night baby care, because they 'fixed it' so you'd need it.
Do whatever it takes to get everyone the sleep they need: nap during the day, take the baby into bed with you and leave her there for the night, feed her anytime she appears to be even the least bit hungry even if she only ate a minute ago, take snacks to bed so they're handy for all of you if you get hungry, keep water beside you while you sleep, too.
Sleep is an enormous issue for parents in the Western world. It is not an issue for parents in other parts of the world for 2 reasons: they know little kids do not regularly or predictably sleep through the night, so they don't keep trying to stop them from waking up naturally, and; almost the whole rest of the world never separates moms and babies through the night, so babies there never wake up thinking they're alone in the dark and their mother has ceased to exist.