I think a ward for her wheelchair and bed is a good idea, even a sigil drawn on her wheelchair kept by her bed. Let me see if I can find anything else… will be back with an edit!
So, we’ve got these spells here on the site that might be helpful.
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▶️ ‘Banishing Grace’: Easy Spell to Ward Off Evil & Negativity – Spells8
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▶️ ‘Magic Armor’: Good Luck Spell to Ward Off Negative Energies – Spells8
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:cauldron: Weekly Witchy Challenge - Witch Brews & Potions - #54 by jan_TheGreenWitch
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▶️ ‘Magic Armor’: Good Luck Spell to Ward Off Negative Energies – Spells8
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‘Shaman Blessing’: An Easy Protection Spell with Sage – Spells8
There’s a lot more but I think these should all give a good place to start! I’m sure you could adapt one of these to your sister’s specific situation.