If two stones have dissolved and the third one has reduced,it is really very good.
You may continue the treatment but keep on monitoring the size of gall bladder stone
after every month.
If you find that the size is reducing,then you keep continuing the medicine but if you feel that the stone has stopped dissolving or it has increased in size,then go for laparoscopic removal of gall bladder
There won't be any problem in her conceiving,if you happen to go for laparoscopic removal.