In reply to ogreville:
If she's really worried, she should wait a few weeks and then try and get the tests - plural. Doing it immediately won't tell her anything - if Lymes has been contracted, she'll need to wait long enough for it to reach her blood and for antibodies to form at a high enough level to be detected in blood tests.
I spoke to Lymes expert in the US last year and his conclusion was that Lymes is just really badly understood. In terms of working out if you've got it, symptoms are hard to gauge. perhaps not even 25% of people get the rash for instance. I'd be careful with your extrapolation because a huge number of cases aren't diagnosed.
I say this as someone who has had Lymes and is just trying another massive dose of antibiotics to shift it. I didn't ever find a tick that I didn't remove very quickly (within 2-5 hours), I didn't find a bullseye, I didn't have flu... It was massive fatigue, some aches and insomnia which finally made me realise what it could be.
I'm sure that you'll both be fine, but there's little harm in checking with blood tests in a few weeks.