There are several.
is the most famous. Draw it on your left wrist, you can do this on your mother in your saliva. You can also add it to her hospital bed post. Using your saliva will put your energy and meld it with the rune.
is a health and immunity system rune. You can draw this, again with your saliva onto any item your mum eats or drinks with. Below is few more suggestions.
https://forum.spells8.com/t/runes-of-odin/49236/81?u=tracys
A very powerful rune. This calls on the power of Thor, the Norse god of protection. You can draw this on a piece of paper, meditate on it, close your eyes and pray to this beautiful god for help and protection. He likes beer, things from nature as offerings. And he’s a warm, kind, gentle energy (not like Marvel)
Norse God of ThunderHere are a few spells for various things to help you through this and your mum.
For stress
https://forum.spells8.com/t/runes-of-odin/49236/32?u=tracys
How to find your rune
https://forum.spells8.com/t/runes-of-odin/49236/45?u=tracys
How to send rune energy
https://forum.spells8.com/t/runes-of-odin/49236/72?u=tracys
For Calm
https://forum.spells8.com/t/runes-of-odin/49236/86?u=tracys
On the mundane, keep your mum as healthy as possible before any surgery, and I hope all goes well. You are in my prayers. 
If you follow the gods behind the runes, the two that can help are:
Thor for strength and protection.
Eir a goddess/Valkyrie of medicine.
Bless
https://forum.spells8.com/t/runes-of-odin/49236/204?u=tracys
Above is how to use the runes Uruz in medicines and also has @mistressofherbs for any herbal remedy