Reply To: survey – how often do you [men] daven for the amud?

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http://beta.hebrewbooks.org/tursa.aspx?a=yd_x6957

I will translate (he previously stated that an avel does not serve as shalich tzibbur on Shabbos and Yom Tov; parentheses are my own):

However, on weekdays, one who knows how to daven (as shaliach tzibbur) should daven, and it is more beneficial (for the deceased parent) than Kaddish Yasom, which was only instituted for minors (to say, since they cannot serve as shaliach tzibbur).

Anyhow, your Kaddish was certainly a benefit for your mother a”h.