@Bibesia
As someone of a similar age who has managed to travel all over the country all by herself for much of the last month, I do get quite impatient with people who are as feeble as this about travel and dealing with strangers.
Well good for you! 
I do get so irked by this attitude from people that 'if I can do it so can you.'
People are different, some people are more anxious with strangers than others, and some people are shy and don't cope with social situations very well.
It's people like you who make people like this feel uncomfortable! 'Oh don't be silly, grow up, don't be boring, grow some balls, man up! if I can do it so can you.' Does my head in!!!
Yes the OP doesn't have to accommodate the aunt's extra 2 people, and I don't disagree with that, but cut the poor woman some slack, she is obviously anxious, and worried about coming alone. Especially so soon after losing her husband. As a pp said, she is probably anxious about being alone, as she has always had his company. Don't be so harsh and unfeeling!
And 'she is 65 not 85 or 95,' and 'she is only 65 not elderly and frail' are such ludicrous remarks.
Why do some people on here act like an age like 65 is 'nothing' and that they know people who run marathons at that age, and travel the world on their own. and still work 55 hours a week, and socialise with strangers all the time etc etc etc? Not everyone of 65 is going to be lively and energetic, and in perfect health, (in fact, in real life most 65 year olds *aren't!') 
These people who judge, and insist 65 is 'no age' are the same kind of people who think you can retrain for a new career at 53, because 'you're just a spring chicken,' and employers are going to be banging the door down to employ a 59 y.o. woman with an open university degree she took 6 years to get!! And of COURSE you can leave your husband at 54, and don't worry about finding another man, there are loads of men out there looking for 54 year old women to settle down with!
And of COURSE it's perfectly acceptable to start having babies at 46. I know loads of people who have done it.'
Mumsnet is like a parallel universe sometimes.
I am not age bashing - I am in my 50's myself, and I can tell you it is NOT a 'young' age to start over. And 65 certainly is not 'young and sprightly' and it's possible someone of that age COULD be 'frail.' And it is on the cusp of being elderly. Why pretend it isn't?
If the OP had said the aunt was 75, or 85, some posters would still have come on here and said 'MY aunt is 99 and runs 10 miles a day, and has karate and abseiling as hobbies. Your aunt needs to sort herself out, she is just a spring chicken!'
Makes my blood boil.
This board sometimes!!! 