Hiya Brian,
It looks like your wife will have no choice but to extend her visa (FLR) which will be another expense currently £601 but as Rayna has said that if your wife lets her visa run out then she could be deported back to the Phils.
I think the above is your only option due to time restraints but on the positive side is that as soon as she achieves B1 level then she can immeditely apply for ILR, she won't have to wait a further 2 years on her visa extension.
More expense I know but like I say with little options left then it looks like the way to go, anyway goodluck...