Typical mom neglecting herself and crying for some me time

So Me, My 3 year old son and best friend all live together. We have been living together for awhile

Over the past 3 years I have been neglecting myself. I am constantly in Mommy mode or work mode

Me and my best friend currently share a vehicle. Which never stopped her from going out with friends spending the night with friends.

I am always at the house in mommy mode I love my son he is my world

So after 3 years of neglecting myself I wanted some well needed me time.

My best friend told me I can’t leave her home alone because her n my son have a cold. “1st excuse”

Then she said we don’t have a second vehicle “2nd excuse” this never stops her from leaving.

Everytime I try to say hey I’m leaving for a hour or two to clear my head she says we’re coming too ugh

The last time I tried to get alone time she raced down the steps and took it upon herself to put my handsome 3 year old in the car and was like take him with you.

She is his Godmother I have never left her alone with him but dang a girl needs at least a hour to herself

Please tell how to handle this.

Update it’s my car and my house she is not on my lease.