You need to start reading the UKBA website first.
http://www.ukba.homeoffice.gov.uk/
Then assess the situation of yourself and your partner. All the information you need is on the UKBA website.
Members here will be able to advise once you've established what path you are able to go down.
You and she WILL need to comply with all immigration requirements. There is no way around that.
If she overstays she will be deported and probably not able to return for 10 years., so don't even think about it.
