Answer: The subordinating conjunction in the sentence provided is "where" and it demonstrates a relationship of place.
Explanation:<u> A subordinating conjunction is a word that introduces a dependent clause and connects this type of clause to an independent clause</u>. The sentence "She can never remember where she left her glasses" is made up of an independent clause ("She can never remember") and a dependent clause ("where she left her glasses").<u> The subordinating conjunction linking both clauses is "where", which is also signaling a relationship of place. </u>