If you can send a DNG file that has the settings applied, she will be able to open it with LR Mobile and copy the settings to other photos - or create saved presets from those settings.
You won’t be able to export the DNG with settings applied from LR Mobile, though; you’ll have to do that on the desktop.
In another forum thread, I came across a website offering DNGs to use as presets, and there is a pretty good “how-to” for getting the DNG files into LR Mobile: https://heleneinbetween.com/2018/04/how-to-use-lightroom-presets-on-your-mobile-free-plus-new-presets-for-travel-and-lif…
I’m not affiliated with the author of this website, but I thought the tutorial on this page was useful.
Let me know now if you need help with how to create the DNG for mailing.
Mike