Did you get ILR based on Tier 1 G with 5 years residence or on the basis of 10 years long residence?
If 5 years residence, your wife can apply to extend her Tier 1 Dependent visa until she meets the requirement for ILR.
If she switches to FLR(M), her clock towards ILR will be reset to zero and she will have to wait 5 years (2 x 2.5 year FLR(M) visas) before qualifying for ILR. The time spent as Tier 1 dependent WILL NOT be counted towards this new 5 year residence requirement.
Char (CR001 not Casa)
In life you cannot press the Backspace button!!
Please DO NOT send me a PM for immigration advice. I reserve the right to ignore the PM and not respond.