I would enquire with two different organisations/businesses:
Three years ago I had to go through the D4 application with the DVLA to reinstate cat C1 on my licence. It isn’t free, but be mindful it may be required. Might be worth speaking with someone who does D4 medicals near you.
Also, there are driving assessment centres that might be able to give you some good advice. Google is your friend in both cases.
Hope it goes well for your wife.
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