1. Debt Buster Loans seem to be what others call a consolidation loan - i.e. taking out one large debt to repay all the others you have. Often they are secured on your house, but not always. I think the phrase is just a (supposedly) nice sounding marketing ploy.
2. It is very rarely a good idea to try & get out of a debt problem by taking on more debt; it is almost never a good idea to go to companies who advertise their loan services on TV - they are likely to end up much more expensive than main stream lenders.
3. It would be much more sensible for her to go to a free debt advice agency, such as the local CAB, or CCCS (see website) & get suggestions from them about the best way to tackle the problem.
4. You do not need to worry about the house being blacklisted - Credit Reference Agencies now have to work on names of people & not addresses. The only link would be if you had a financial connection, such as a joint account. You could double check by getting your (& your wife's) credit records from the 3 agencies - Experian, Equifax, Call Credit (see websites).