A meth lab can have a strong uncommonly sweet smell; not like a perfume, but something more like a lightly scented cleaning Meth labs emit noxious and extremely strong odors that are hard to cover up.
For example, she might be possessive about an object, not allowing anyone else to touch or use it. In a relationship context, possessiveness is when you do not want your partner to spend time with anyone else or even pursue interests outside the relationship. Merriam-Webster Dictionary defines the word as wanting all of someone's attention and love..
A strong feeling of possessiveness, often caused by the possibility that something which belongs, or ought to belong, to one is about to be taken away. The word can be used in a positive sense (e.g., the jealousy of God), meaning a passionate commitment to something which rightly belongs to one. It can also be used in a negative sense (e.g., human jealousy), to mean a self-destructive human emotion similar to envy.