You must first determine whether his/her job specifications include helping you in research activities. That is one. They may do your research activities in ways that you may not like. For example, saving documents where you don't expect, which may present a greater challenge when you need them.
You also have to determine whether your AA is academically inclined.
It depends on whether you want your AA to log into RG through your account, as an outsider, or through her own account. Through your account, you may give her your User ID and Password. She may also try to get her own account if she has the required credentials. Otherwise, she may get into RG as an outsider and download files that are available.