Laxido is a laxative as I am sure that you know, here is a link on it -
http://www.nhs.uk/medicine-guides/pages … ine=Laxido
My dad used Lactulose morning and night and that worked well for him. He also tried Movicol but that wasn't so successful for him. Many people here have used Lactulose to help with things. The other powder that you talk of could have been enzymes to help your mum with digestion issues and breaking down of her food etc.
I know that it can be hard for you getting all of the information now second hand as it were through someone else, especially so if they themselves are not sure what is been given and what for etc. Perhaps you could speak with your mum and see if she would agree to you talking directly to her gp every now and again?