Menstural Bleeding not stopped. Be done?

My mom is  47YO her Menstural Bleeding has not stopped even after 23 days. She has been taking regestrone 3 times daily . Her endometrial thickness was 21mm & biopsy was done 2 weeks ago the report says it's thickened due to harmonal influence. 2 days back the doctor gave pause injection & suggested to take pause tablet 3 times with regestrone . Even after taking both the tablet her bleeding is not reduced. She says her bleeding is maximum in the mornings as soon as she wakes up. Because of the bleeding she is getting irritated easily & she worried about this.  During her last period also she had bleeding for 15 days after which she took divery tablet & it stopped . But this time even after trying divery , regestrone her bleeding is not stopping. Please suggest some remedy to stop bleeding . Is this problem normal amongst women of her age ? What best can be done ?