If Super Suz is riding within the EU, she will probably never be asked to provide any documentation for the motorcycle and the fact that she has (assuming she manages to organise it) a valid insurance certificate showing her as being insured to ride the motorcycle, all will be well. "Borders", as such, no longer exist between EU countries. You generally drive through or around an abandoned customs post and past an EU sign telling you that you are entering another country, followed by another telling you the applicable speed limits for town, country and motorway.
To dot all the i's and cross the t's, Suz could ask her relative to write a brief letter of authorisation, but it likely won't be needed. She will probably not, however, be able to take the bike out of the EU without major hassle. To enter Russia, for instance, it is essential that the owner of the vehicle travels with it.
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