The dependent cannot enter the UK as the dependent of a tier 1 visa holder if the person on whom she is dependent on is the holder of ILR. Her visa is not valid. She will almost certainly be refused entry. I think I already said this!
"Visa is not valid" :- so how come a dependent is allowed to have the ILR with invalid visa if he/she remains in the country? i think you are referring to the old rules whereby you need to switch. Also, " She will almost certainly be refused entry". not very certain there ?