Can subject complement occur after “as”

In the sentence : She first came to Canada on her own in 1998, and committed to music-her passion, both as a songwriter and a singer...”

Is “as [a songwriter]/ [a singer]” subject complement? I found the sentence as I was reading an article online and haven’t been able to stop thinking about the “as a singer....” part since. I’ve been trying to find the answer online but couldn’t find anything. Thank you for your help! :)

There is no linking verb in your sentence, so there is no subject complement.

As is a preposition here, and as a songwriter and a singer is a prepositional phrase. The prepositional phrase acts as an adverb to modify the verb (intransitive) committed.

You can simplify your sentence to better see this:

She committed to music as a songwriter and a singer.