Unfortunately, as physiotherapist, I cannot give an educated answer to your question. Your specialists will be able to help you better.
From experience in rehabilitation, I can say that back operations on elderly patients, especially if they have poor general health, can have adverse outcome.
My suggestion is that you consult a physiotherapist, who can assist your mom in doing exercise, within her ability. This is the safest option. Then assess the situation after a few months, before you decide on any treatment option that involve risks.
I often hear people say: "I would rather walk and play cards with my mom while she is managing her pain conservatively, than to put her through serious procedures that us, as a family, cannot manage".
All the best,
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