* "Mismo" means "same" and is a masculine adjective.
* "Mujer" means "woman" and is a feminine noun.
To say "same woman," you should use:
* "La misma mujer" (the same woman)
* "Esa misma mujer" (that same woman)
* "Esta misma mujer" (this same woman)
It's important to remember that Spanish is a gendered language, and you need to match the gender of the adjective to the gender of the noun.