How wonderful that you are so caring towards your mother!
I think that there are two things to consider here:
One is that it is possible to make some good friends online. And meet potential dates that way. Not everybody who is online is a scammer - or even just weird!
But, of course, as you know, there are plenty of scammers out there too. And it can really help if someone is well-informed how to recognise them. There's a super guide to 'Are you falling for a love scammer?' right here:viewtopic.php?f=13&t=3607
Perhaps your Mum would like to read it? She's not too old to learn something new - with her experience of life, she should be able to take this in maybe even easier than a younger person, and apply all those checks and safeguards to anyone she is in contact with.
We all make mistakes in looking for love, and I guess you can't protect her from all of that. But she can protect herself from the scammers who she might come into contact with. One good rule: Never send money or gifts (or receive money or gifts) from anyone you have never met. Better still: no money or gifts exchanged with anyone you have not met lots and lots of times, and
introduced to your family too. Genuine men will understand that.