Has she asked to move in and have you turned her down?
If not, then I don't think it makes a difference if you reset or not, as far as I know. Sometimes it takes a while and you can just keep trying to talk until they ask you to move into your town, so a few tries could do the trick or they could not. If you want the extra time though then I don't see why you couldn't reset so you can spend the same amount of time talking to her as you have so far.
If she takes forever and doesn't ask you about it, check your whole town for a plot. Even if you think you have an extra villager spot, you may have gotten one through wifi or SP that can have plotted or something.
I got her to move in. I talked to Katrina, wore the item she told me to, wore a clover and she accepted without hesitation. I think I was having bad luck?