Brief Answer:
It seems like vitreous hemorrhage.

Detailed Answer:
Hello
Welcome to Health care magic
I am Dr. Dadapeer K, an ophthalmologist and I answer health problems related to eye.

It seems from the history that your mother has lost vision in one eye as a result of bleeding in one eye.
This indicates that she probably had vitreous hemorrhage. Since she is also having same problem in other eye this requires evaluation to find out the underlying cause and treatment accordingly.
The commonest cause for spontaneous vitreous hemorrhage is diabetic retinopathy.

The treatment of this condition to prevent loss of vision is by early surgery in the form of vitrectomy and treatment of the underlying cause.

I want to have few more details yo answer more accurately like,
Does she is having any systemic diseases like diabetes, hypertension, bleeding disorders...., if so please mention there status
Does she is having any other eye disease other than bleeding in the eye
Does she has undergone any investigation and details
Treatment she is receiving for eye condition
Please mention the details of injection shots she has received.

Please do answer the above questions so that I can answer your question more accurately.

Thank you
With regards

---