She needs to respect your space. You don't need to interrupt your dinner to answer her calls. If you don't feel comfortable telling her directly to back off, tell her that you are busy or have something else going on that you will not be able to respond. For example:

"I'm starting xyz soon and will not be available as before." Inform her ahead of time and force her to change her expectation, then...here comes the most important part...

..stick to it!

Don't answer her calls as before and take longer time to return calls. Make her adapt to this change. She's only calling you this much because she knows she can get away with it. Don't continue to be her target. Otherwise, she will continue to push boundaries.