Question

Brenda can remember past just fine but is unable to form new memories. she is experiencing:

Answer 1

Brenda is experiencing the kind of amnesia known as "Anterograde Amnesia".
Anterograde amnesia is lost the capacity to make new memories after the incident or event that caused the amnesia, prompting a fractional or total inability to remember the current past, while long-term memories from before the occasion stay in place.