I believe the Kiln requires a box mod. If it is the case that a box mod is no problem, then I would suggest the Puffco Plus just because I prefer the easy cup design with the dap tool. I also believe it is the tastiest concentrate pen I have tried that is out there currently but that is really a matter of my opinion so don't take it as fact. If the dab tool is not a requirement, Divine Tribes has an atomizer that is very similar to the Kiln but I believe a newer and better design.
If you need an all in one setup that includes a simple battery so she is not messing with a box mod then I would suggest the KandyPens Elite or even the Lynx Zero because their lowest temp setting is lower than the Puffco Plus battery settings. The Puffco Plus is a great unit but only on a box mod IMHO. The other two, while I have not tried, have been recommended around here by low temp flavor chasers.