Hi Alhan
Welcome to the forum.
You might want to have a look at the following FAQ which explains where everything is;
www.benefitsandwork.co.uk/guides-for-claimants/faq/forum .
DWP cannot remove your daughter from LCW, your daughter would loose her LCW if she failed her WC assessment if you have a look at our guide it will explain what claimants need to pass the LCW/LCWRA
As your daughter was placed in the LCW group this means she passed the first test (needs 15 points or more) but failed the second test (need to fit in one of the descriptors)
As your daughter is in the LCW group they would be eligible to a work allowance. We would advise your daughter to seek advice from their local Welfare Rights Organisation:
advicelocal.uk they will be able to take all their circumstances into consideration when giving advice.
Gary