Your doing a great job. I think all you have to be sure is that your not using the dummy to replace a feed (like if she woke up in the night and you popped the dummy back in instead of feeding her) which you clearly aren't doing. Plus she is gaining weight beautifully so rest assured she is getting enough. You need to do what makes your life easier and if thats the dummy use it. Will be easier to take her dummy of her when she is older then her fingers. Babies such for comfort not just when they are hungry so I wouldn't feel bad about using it if it helps to comfort her.