hay congratulations that you have got a new friend! Lolz :-)
well you should not worry about your cat as cats have ability to deal with such situations without any kind of human help.  You just try to take care of her food as they need more food after delivering kittens, provide her pure and clean water and a comfortable place to sleep with her kitten.
 

 If she's not in distress I wouldn't worry about her. Cats are smart and know if they need help. If she needs help she will let you know by how she acts... If she's still in labor and has more kittens to deliver than she probably wouldn't be taking care of the one kitten she has. She would also be restless and very vocal. Our cat had 2 kittens in the morning, and she wouldn't tend to them and let them die, but that evening she had 2 more, 1 was stillborn and the other one was fine. She tended to that kitten and he's fine.. He's now  a year old and healthy. Just watch her and see how she acts, if she starts to ignore her kitten she might be going into active labor again. If she seems distressed then by all means call your vet. Good luck.