it's weird that she don't have studio proposals.
In general, studios invite actresses to perform. Often times agencies will "work" a model with various studios, to get the actress roles. Sometimes this ether doesn't happen or is not an efficient process. Here's where fans of actresses, such as Danielle, can help by imploring various studios to shoot her, via Twitter.
Tweet a picture of DD, saying something like: Hey @wickedpictues and @evilangelvideo - you HAVE to shoot some videos with @daniellederekxo RT if you agree!
Tell all your friends to do the same. Best of luck! :-)