^I think the fact that she watched him bleed out without phoning for the emergency services made a murder charge inevitable, tbh.
You see, if she did it today, you could probably phone 999 straight away knowing an ambulance would take an hour.^
There are numerous cases where men have murdered their wives in horrific ways- stabbed them or hit them with a hammer, where they were only found guilty of manslaughter, not murder. There was also one guy who threw a vat of chip fat over his wife, she died slowly and painfully, and he was not convicted of manslaughter or murder. Historically women have been less successful in getting juries to accept their partial defences and have been more likely to be found guilty of murder - even when they acted in the heat of the moment. So, yes, she may well be convicted of murder, but I do hope the jury will only find her guilty of manslaughter.