Call her! Ask her!

One of the most difficult things in English is when to use "to" and when not to use it. With call and ask, for example, we don't put "to" between the verb and the object. We say "I'll call her," not I'll call to her. The same is true for ask. "Let's ask him if he knows the answer." Also, with things like a company, the concept is the same. "She called the restaurant and made a reservation."