Hi there,
I really would keep trying with the df. If you only tried it once, then that's not giving it a chance to work properly. Your lo doesn't yet know that she is supposed to sleep through the night (and, tbh, she's probably to young to do that anyway). What the df does is top her up to go for a longer sleep, so, when she wakes a couple of hours later (and she probably will), you can be confident that she is not waking out of hunger, but habit. This gives you the foundation to break this habit, and getting her back to sleep. Once you have done this a few times, then she will stop waking so often at night. You do need to do this a few times, though, and, with a lo as young as yours, she probably does still need another night feed, maybe a very early morning one.
I guess I should make her bedtime a little earlier and then do a dream feed before we go to sleep? Does that work for everyone?
That does work for most people, it definitely worked for us, but you do need to do it consistently for a while before it pays off.
HTH