sure, if your 140 unfortunately get denial directly, all your 485 will be denied right away, in this case, she has to come back using H4 visa.
But if only your 140 get RFE,it should be fine, they will not touch your 485 until the result of 140 comes out.
But if only your 140 get RFE,it should be fine, they will not touch your 485 until the result of 140 comes out.