If you read this ch carefully, you'll find clues leading up to the events in the next ch...
Chapter 15
Through her binoculars, Regina watched him leave his apartment. 7 am just like every morning. She made a note on her notepad. For the past several days, she'd been meticulously tracking his schedule. Her notes revealed the extent to which she was determined to succeed. It had every little detail about his daily habits, such as when he went out for coffee, took a walk, and went to bed. It listed the most important detail. When he would be the most vulnerable.
Her revenge plan required a crazy amount of precision in order to be enacted. Failure was not an option, for she quickly found that her magical abilities were very limited here in Storybrooke and that with every time she used magic she tired more and more quickly. Pretty soon, she wouldn't be able to use magic anymore. This plan would probably be the last time she'd ever be able to use magic, but it was for a good cause.
Author's note: This ch was intentionally short. It's mostly just a filler leading up to the next ch which I promise is super exciting. Sooooo review if u want the next ch up asap!