Oh wow - how dare a tick land on her cute leg ~! I would ask your vet about what you need to do - there are only certain kinds of ticks that carry the bacteria that cause Lymes disease but it is prevalent in some parts of the country more than others....
Here's a site you can read - it may make you feel better - it has pictures of the ticks that you need to be careful of
http://www.thepetcenter.com/gen/lyme.html
Poor Maddie and mom - I bet she'll be just fine -