Leave the fridge open then lock her in the freezer. The freezer should freeze her and/or murder her (not to educated on the topic of freezeing people). Take the frozen lady and wait for winter. Find a pond/river and break a hole to throw her in. Then the lake/river will freeze over and slowly heat her up due to ice surfacing onto of the water (aka) the warmest part. She will eventually heat up and if she is still alive will drown being trapped under all the ice.
If you dont get it the freezer gets colder if the fridge is open. The freezer uses the coldest air and lets some pass into the fridge. However if the fridge door is open the freezer uses all of the cold air making it WAY colder than it should be.