I don't wish to scare you but turburculosis is a disease of the lungs that is really really serious. It is a notifiable disease in Australia which means that her Dr should be notifying the health authorities that she has it (they most likely have) there is then a process where everyone that your friend has been in contact with for a certain amount of time (I think it is more than 12 hours) will be notified and tested. If she was staying in your house all weekend then you should be at the top of the list.

If I were you I would be ringing your friend and asking how they are treating her and if she has been asked to provide a list of people that she has come into contact with (it is slightly different in every state) and then ringing and speaking to your GP about it.

As for your DD's issue - I would probably make a Dr's appointment about that as well - partiaularly if there is a family history of cystitis.

HTH