I think she is partly right. Your happiness should be based on what you have and what you are now. Appreciate the present and be aware of it.
But at the same time, plan for the future. Knowing what you want for the future can guide your actions today. And if those plans don't work out, don't be sad. Count what the experience has taught you and celebrate that, and then move on.
In my life I know where I am, but I also know where I want to be and that informs me as a journey on.
Jaden3