As fast as she is growing at this stage, you really don't have to worry about overfeeding her. In fact, it's pretty impossible to over feed a puppy! As long as she is peeing, pooping, and playing/energetic, stick with it.
If you are home with her, you might try splitting up her meals. Give her the wet food at a certain time of day, either morning or evening, and leave dry out all the time. Wet or moistened food can spoil rather quickly.
My Sam was 2.25 pounds when I brought him home at 12 weeks, and he's super finicky (my fault for trying to switch his food too soon!). He just turned 5 months and is around 3.75 pounds. I'm lucky if he eats 1/3 cup of food all day.
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