I understood that from several points, but regardless, tense has to be consistent.
Telling a story in past and present tense gets confusing to the reader.
Can she not instead say, "It was odd; I found it easy to remember the planes and angles of his face, and the deep timbre of his voice, but I couldn't quite recall the vivid memory of our first moments." ?
It's not that different from what you said, but the tense is consistent. Which is nice for the reader and for clarity.
