If it were me, I'd buy and send her send her something from Thomann in Germany. They serve the Czech republic.

https://www.thomann.de/intl/ukuleles.html

You can change the currency to $US (prices are a bit approximate as they will vary with the exchange rate) and shipping is cheap. They normally use UPS as their final courier in the UK.

Note that Harley Benton is the Thomman own-brand, and their electrics are certainly well thought of. You also have a lot of familiar brand names to chose from.