Document, document, document! Any attacks, any attempts to disrupt visitation, any actions your ex takes that cause problems.
If you use it wisely, going to contact only through email is your friend. Using email, you have documentation you can provide the court. (Just make sure they don't show your worst side.) You have the ability to take the time to answer things your ex says, so you can avoid getting into conflicts with her. You have a greater ability to ignore attacks by your ex and just respond to actual questions regarding things like visitation, daycare, etc.
Other than that, sometimes you just have to sit on your hands and wait until the court date gets there.
You have temp custody, so that's on your side. Courts don't like bouncing a child around.