Don't forget that some "throttles" can be set to only allow 6km/hr, and some can be set to only give power when pedalling. That includes the one fitted to the Samebike 20LVXD, which looks like what she had. The 750w ones all have fat tyres.
Either the police made a massive mistake or her bike was an direct import with a motor marked 350w or whatever, like this one:
SAMEBIKE 20LVXD30 e-bike seems to offer several convenient and practical features for commuters and cyclists. Here's a breakdown of the key features you've mentioned: Foldable Design: The e-bike can be folded up, making it easy to transport and store. This eliminates the need for a separate bike...
alloybike.co.uk