Okay, the round worms will look like spaghetti. Use gloves (or a plastic baggy) to pick them up and don't let other pets (if you have them) get near the poo. Wash your hands really well (needless to say huh!). The wormer that is over the counter is often only for one type of worm (such as tapeworm). The over the counter medicine doesn't work nearly as well as the prescription one. I've heard of dogs coughing up worms, but you may want to call the vet to ask about it.
You'll also want to get her on heartgard (or another preventative with ivermectin ). This will help with any future worm issues. It disrupts the microfilariae (baby worms) and should keep her clear.
Make sure the worms in her feces are dead. If they aren't, she may need to be wormed again.
Worms are very common and my pup had them too. Although I freaked out because they were alive when they came out :-S I hate worms!
Also, the worms can come back if you don't worm them a certain amout of times when they are pups (and use a heartworm preventative with ivermectin). She probably did worm her, but once isn't enough usually.
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