What exactly do you feel the issue is?
You say she is happy in her own company, and that this is not the first time you've been on a trip without her - so when you say you sense she is 'not thrilled' - do you think she is anxious about being alone and something might happen to the house/her, or anxious that something might happen to you?
Either way, if she is not interested in joining you for part of the trip as you've suggested, is there perhaps somewhere she would like to go/someone she would visit which could take up a good chunk of the time you're apart - that way you've both got something interesting to occupy you and help avoid worrying about each other?
fwiw. if you're both in your sixties and you've made it through life this far unscathed, then odds are you'll be just fine this time around too.
Jx
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