This sounds most distressing for your mother.
Does the system show that she touched in at the start of her journey today? (Not sure how long this normally takes to be visible)
And did the inspector give her any paperwork?
KeyGo's system only shows touches made at the end of the day. Logging onto her account with her permission, also confirms this.
No, the inspector didn't give her any paperwork.
Was she issued a zero fare ticket to complete her journey?
Was she issued a receipt for the confiscation?
What grounds did the inspector have for thinking the smartcard didn't work?
What product/s are loaded on the smartcard?
Was she questioned under caution?
Was she told how to obtain a replacement smartcard?
No zero fare ticket and she wasn't given any receipt.
From what my mother told me, he claimed that it couldn't read the card.
Only KeyGo is loaded.
She wasn't questioned under caution.
No, she wasn't.
I'm sorry to hear this. One early task could be to write down what happened in detail, and/or make a sound recording if that's more convenient for a first version, perhaps using an app or video to record sound on a phone. Those might be helpful in responding to an allegation, and in a complaint.
Was he a revenue protection officer? Your mother might put in a subject access request, if/in case he used a body camera.
Could she give more detail about how the card was taken by force? Just in case, is there anything she did or said which might have been interpreted as suspect or provocative?
She took a video recording of at least part of the incident.
He was an RPI.
She tried to get the name of the officer on his badge (I think - I wasn't there) and this gave him the opportunity to take it out of her hands.
I did report this to BTP and since I made the OP, they saw my mother about it, so at least some help at the moment.