Hi Bettie,
First, Lucky is lucky you rescued her.
When you say she is a small rabbit, would you say she's a dwarf rabbit? If you go to
http://www.arba.net/photo.htm you can see pictures of different types of rabbits so you can get an idea what type Lucky is.
Knowing what type of rabbit Lucky is is helpful in knowing how much she should weigh. When you took Lucky to the vet, did they comment on her weight?
A healthy diet for rabbits is lots of timothy hay, available all the time. She should get pellets (Oxbow Bunny Basics are the best) in the morning, and the amount depends on her size and age. Probably a quarter of a cup is adequate.
For dinner she can have fresh produce. It's important to avoid any produce containing high amounts of calcium, as this can lead to sludge in the urine or bladder stones. Bunnies should not eat spinach, parsley, and dandelion greens. Safe greens for them to have are romaine, leafy green and red, bok choy, and endive/chicory.
Rabbits should not have anything high in starches such as bread, crackers, cereal, or oatmeal. Treats high in sugar should be fed sparingly: carrots, apples. They should have no dried fruits, such as raisins.
I'm concerned about one thing you mentioned at the beginning of your question, that Lucky has plop stool overnight. Does she have stool sticking to her bottom in the morning? Is there just some that's not in the liter box? I want to make sure I understand what you mean by this since this can be something serious.
If you can let me know her weight and what type of rabbit you think she is, that would help too.
