Thanks for all your replies. Helpful as always.
To answer a few questions:
I do know for a fact that she was genuinely sick and genuinely had jury service. I absolutely believe her about the BF (on both occasions).
There is a contract of employment between us, and as you would expect she is entitled to paid sick leave under its terms. DH's issue with her sickness is that he didn't think she needed to take 3 days (she had D&V which stopped at midday on day 2, and he thought she should have worked day 3). But then DH is the type who thinks the world stops turning if he takes any sick time off work, so I do tend to discount his views on sickness a little.
Jury service is a nightmare for employers. As an employer you have to tell the court upfront how much of your employee's wages you will stop paying. And you can't know how much the court will pay her back until after the jury service is done. (If a juror is required to attend court for more than 4 hours then get £65 tax free, less than 4 hours then £30, if they're not required to attend at all on a given day then they get nothing at all.)
So I could have told the court I would deduct £650 from her net pay for 10 days of work, but there was absolutely no guarantee that she would actually recover that amount from the court. And then she would have been seriously out of pocket for simply doing her civic duty. As it turned out, she wouldn't have been entitled to anything like as much as £650 because she wasn't required to do 4+ hours every day. I talked it over with DH and Nanny, and we agreed to deduct £300 from her wages (and in the event she was able to claim almost exactly that amount), but our costs for temporary childcare were considerably more.
I'm very interested to here that most of you think that the time for the BF's bereavement should have been taken as annual leave. I've taken that on board.
Today was a different kettle of fish altogether. I don't want to give any details because the guy in question has been arrested and charged. However, I will say that it was less than rape but considerably more than a slap. It was a blind date - think kidnap or false imprisonment and you won't be far off. It sounds absolutely horrific and the local MH team are involved with this guy now as well.
Nanny was obliged to give evidence to the police, and had had absolutely no sleep last night. Again, I can't give details but the BF managed to make a call to Nanny by pressing LNR, and nanny could hear part of what was clearly a very traumatic event.
Yes, she could have come in for 11:30, but frankly she was in no state to work. She was clearly exhausted and distressed.
She is an excellent nanny, and if she wasn't an employee I would count her as a friend. She always goes the extra mile for us if we're unexpectedly delayed at work or something otherwise comes up.
Her one fault, if fault it is, is that she's overly willing to put herself out for friends and does get caught up in this kind of thing.