Right now, shades of green is the only avenue of approach to get the discount. The ticketing offices on military bases are closed due to the pandemic and they will refer you to Shades of green.
This is a blurb from the shades of green website requiring what they would need from her but the hassle is worth it, not paying taxes and the magic your way ticket pricing is a Bigger discount than what’s Disney’s offering and so worth it all things considered.
Basically have her call this number (407) 824-1403 Or email
advancedtickets@shadesofgreen.org to order tickets
It’s the only way because of covid to get Disney salute(active duty) or magic your way (disabled veterans with VA cards, etc for example)
So how it works right now is you call them or email them or who ever does it, then they will follow up with the brochures to your email with another form you fill out,the person going has to print it out, you cannot digitally sign it, it has to be signed in ink, you can either scan it back to the email or fax to the number on the email, then you will hear back from them soon and confirm everything and then take your method of payment at which time will mail out your cards. I politely asked them to scan my tickets to my email after the purchase so i can add them to my disney experience right away and start making my reservations right away and it worked. 4 days later i got my physical tickets. The whole process took a day and half and it took a bit because i email the form digitally and had to submit it in ink.
A bit of a hassle but the only way to get them, sorry. Oh to answer your question your MIL discount is the Magic your Way (Base Tickets) on the brochure. Only Active Duty, 100% disabled vets and retirees get the Military Salute discount, everyone else gets the base military discount which is still good, key word is no sales tax!