There aren't many Freeview recorders on the market these days. You are basically looking at Manhattan and Humax.
You'll need to plug an aerial into them, you'll be able to pass through the one to her TV. i.e. You plug the current aerial from her TV into the recorder box and another aerial cable completes the circuit and goes from the recorder box to the aerial itself (e.g. the wall socket).
The most basic Manhattan currently is the T2-R, which doesn't have internet features and is cheaper as a result.
https://manhattan-tv.com/freeview-hd...n-t2r-recorder
The T3-R is a similar box, but the main difference is internet requiring features. It will work without internet though.
https://manhattan-tv.com/freeview-pl...n-t3r-recorder
Humax have a few models. Again, even though some have internet features they will work as recordable boxes without broadband being available.
https://uk.humaxdigital.com/product-category/freeview/
Most modern Freeview boxes tend to not have Scart, so you'll need one of those HDMI.