If she's ever with a true BBC, no she won't be the same after. He's going to fill her up in a way that you never have, and it's going to be better and hotter than any big toy or dildo you might try to use with her.
And she's not going to forget how it felt, and it's going to change how any other cock feels inside her going forward.
I say this because I had a married housewife as a slave for a number of years, I turned her into more of a "hot wife" for me (cucking her husband) where she ended up being fucked by a black friend of theirs who had a 8-9" thick huge cock and she described how it was sucking him and being fucked by it.
