Northern mockingbird doesn’t sing

Hello.
Usually when I observe a mockingbird, he is busy sampling other bird songs.
For the last few months, there’s been a resident northern mockingbird in my neighbourhood that does not sing or imitates. He/she only makes a simple call.
Is that because it’s a juvenile?
Here is an observation : https://www.inaturalist.org/observations/202605123

The bird does not appear to be a juvenile. More likely it is a female. Both male and female mockingbirds sing in the fall/winter because they are generally defending separate territories of food resources, but even during this time, females don’t sing as much as the males. During the breeding season, females rarely sing; generally they only sing at times when the male is absent from their shared territory.

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thank you for your explanation, @swampster