I live in Hong Kong and I generally support the protests but I think some of the reporting is exaggerated. As for 'expats have been killed and beaten', this is a misleading claim. Nobody has been killed. Many have been injured, but these are protesters or others right on the front lines. There are some mysterious deaths going on, which are extremely important to investigate (and unlikely will be), but they're not confirmed as murders, so saying that people, let alone expats specifically are being killed, is misleading.
It is a more chaotic and unpredictable time but if you aren't out there protesting then you aren't really in danger.
I'm not saying this to downplay the very important era that HK is in right now, because it's huge. However, people are living their normal lives and working and studying as usual. All things considered, there is very little bloodshed and its limited to the active protesters. It is easy to avoid protest areas.
If I were you, I would be hesitant to send her here too, as a Mum. I just wanted to give a perspective from the local area. The current risk of her coming to harm, unless she gets into the protests, is extremely minimal.