Good evening my mother has ovarian cancer stage 1A...

Dear Customer
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whar is the approved treatment for ovarian cancer :

1. surgery 
2. chometherapy including :
- carboplatin (platinum-based)
- paclitaxel  (taxane-based)

is immunetherapy an option to treat ovarian cancer :

its could be , unfortunately its not apporved yet as a basic line treatment for ovarian cancer , clinical trials and researchs are still going on to determine the effectivness of immunetherapy to treat ovarian cancer 

what is the other alternative options that may help in this case :

1. radiation 
2. hormone therapy  ( hormone blocking medications 
3. targeted therapy : special oral and IV medication to fight ovarian cancer cells such as : Olaparib and rucaparib
4. clinical trials 

our opinion :

immunetherapy is a promising treatment for many cancers , but as we mentioned earlier , its still under developing and reseachs . on the other hand , targerted therapy may be beneficial in your patient case especially that she is BRCA1 gene abnormality 
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Kind Regards