Advice please

Hi all,
Just a worry really that someone may be able to help with, my mom had grade 2 BC March 2008 she had mascetomy and lymph node removal as was in 15 nodes she underwent 6 bouts of chemo then 3 weeks rads and since has been doing great and just goes for yearly mamograms in herself she is fab walks for about an hour a day goes to keep fit 6 days a week for an hour and is always out and about but I worry as at night and in the morning she seems really croaky in her voice in the day she is fine but at night it seems worse I’m just really scared it’s something sinister because of what happened last year, she is on arimdex which I know has loads of side effects she has hot flushes etc but just wondered if anyone else had this croaky sound thank you for any replies xxxx