Hi Sentokin
Sad to hear about your mother problem, however glad to know that
you a fillial child who seek to alleviate your mum suffering.
You did the very right thing by seeking professional medical
help.
In term of spiritual wise, I hope you could read with an open
mind about the idea of karma effect.
When a karma is ripen, its will produce an effect. Currently,
your mum is experiencing the effect, it is adviseable to accept the
effect and repent on her behalf for any negative karma seeds she
has planted in the past. It may not be this life but
previous.
Next, try to chant and delicate the merits to her. Of course, on
this forum there are a lot advise on what chant to be used. It
depend whether you are a nominal Buddhist or practising one.
You can used a text which you are familiar. However, if you do not
know any, you can try chanting, "Namu Myoho Renge Kyo." until
you are satisfied, just delicate the merits to her. You can do it
in your home facing a wall.
Last year, when my uncle was in ICU. I just do it by his bed or
home altar. Due to the good graces of triple gems and his own
karma, he awoke and now is walking around.
Do you remember in Chpter 16 Lotus Sutra, it was
said Shayamuni Buddha is like a father to us, always keeping a
look out for your well being. He will not leave or forsake us in
time of trouble.
Gassho
Nichiren:"Namu-myoho-renge-kyo is like the roar
of a lion. What sickness can therefore be an
obstacle?"