Sassy, she knows damn well that, in her own country, what she did was abduct them.
Obviously they weren't very integrated for having lived here so long, it's harder to be when one of you isn't native, or she'd have known how much UK courts favour awarding full custody to the mother here, and that joint custody she would have understood it in both CA and CO law doesn't really exist here.
She was also trying to abscond with the kids, had her passport removed for that very reason.
Then, if she is in fact found guilty of what the charge, murdered them.
But again, it's only a charge at present and there's been no confession released to the public so who knows for certain.
I don't get flower-laying, either.
When we lived in Leith a chap was murdered in the road outside a pub barely a block down after a brawl, and strangers left flowers.
I found it unsettling.
In the US, some states have had to ban roadside 'memorials' as they cause more accidents. Some anthropologist in Denver did an entire PhD thesis on them!