Posting on behalf of my sister

My sister was diagnosed with PCOS early teenage years she is now 31 she has been with her partner for over for just over 13 years and been actively trying for her first baby (her other half has a son from a previous relationship) and they have done tests on her from having die flushed threw her tubes to see if there is a blockage which there wasn’t they have put her on metiformin which she was on for almost a year and because that didn’t do anything they took her off it they put her on a special diet but it gets her down as with PCOS you tend to put wight on she eats heathy and exercise daily and nothing works for her to lose weight they won’t put in for IVF as they say she isn’t getting pregnant so they won’t do that which breaks my heart as they basically mean she has to go threw the joy of becoming pregnant and lose a baby before they will help any further which is discussing every women deserves to become a mother so if any of you lady’s have any advise for my sister please share with me