Ah, I see now, Sorry for my mistake.
Your wife will be under considered for ILR under the 'old rules' this means you will not need to comply with the new Financial Requirements.
For applications of ILR (under old rules) the caseworkers are under instructions not to refuse solely for financial reasons.
Personally, I have not heard of anyone being refused for being on benefits etc.
There would need to be some very serious reasons for the ILR to fail at this stage.
With you wife in employment (even part time) I doubt very much there will be any problems.
Good luck and please try not to worry.
There are (and have been) many folks in the same situation as you that have seen no problems with granting of ILR.