Adding to what Chris has said above...
For those that dont know, GNUF is a uke festival in the UK and UWC is another HUGE uke fest in Indiana, USA
So unless she has internet on her phone via an international roaming plan with data service, or access to WiFi in the UK, she is likely to be offline from the internet, and UWC takes place in a huge field, in the middle of nowhere so I'm told, at least 10 miles away from civilization so cel towers may not offer service while there.
UWC is literally in a giant field, with no facilities other than porta-potties.
So with all the travel and access hurdles, and the all-day activities, she likely will only be checking her messages once per day if possible, and for that she may have to travel closer to a cel tower or public WiFi in order to get service.
So right now, patience on part of customers is likely to be required as these specific events are a sort of tradition for many, and bring people from all over the globe, and only happen once per year...
As others have said, she is a one-lady-shop and while traveling, the business of 'Mim's Ukes' is likely closed for vacation.
Dont worry, it's only temporary, and according to all the rave reviews here on UU, it's worth the wait while she's away from her shop. Rumor has it that her service is unmatched.
So maybe we can cut her some slack here, as everyone deserves some time off once in a while.