I can't see to give Melissa her potion please help

Do you have the potion in your bag or your mansion inventory? Sometimes that matters. Most quests won't register you have the item if it's in your backpack.

But I do have it I crafted it and everything. I even made sure to put it in my bag before I go to to see her.

The game tends to ignore items in the bag. Leave it in the mansion inventory. It's a little counter intuitive.