i think we have had 1 day b4, but even still thats

news
should be no problem coming to the uk, but your wife should have a visa valid for 27 months, but to apply for ILR your wife basically needs to be in the uk 23 months..
but you plan to stay til march, thats 6 months, 27months - 6 months = 21 months your wife would be in the uk b4 her visa expired..
so basically your wife would
probably have to apply for FLR before she could apply for ILR. (extension to her visa, so untils shes been in the uk at least 23 months, or they could extend it for 2yrs.. )
so it will cost you about £450 more and a bit of form filling (similar to the spouse visa)