How can a support worker help or assist a client with early onset dementia?

Ensuring the safety of the patient and allowing the patient to verbalize such important details about her that will be useful.

making sure that the client made calm as possible

1. Firstly early stage refers to the people irrespective of the age who are diagnose to some disorders. Role as care giver.;support, love and companionship. 
2. Also help with daily life as needed. For instance; in appointments keeping, recalling familiar places and people, keeping time for medications,planning and organization, remember names and memories. 
3. Support them emotionally
4. Share in their worries. 

Dealing with such condition is by providing what he/she asks and give them special treating.