AH
It doesn't quite work like that

the initial contact will be in the form of a letter inviting your wife to claim PIP, although we often use the word "transfer" in the forum it really isn't one, rather a new claim from scratch.
Have a look at the PIP Claim guide for more details about the process and what the claimant needs to. See
www.benefitsandwork.co.uk/help-for-claimants/esa1 Gordon