Only combat damage dealt by commanders matters for the purposes of a state-based action added in the traditional Commander variant (C.R. 903.10a). Whatever damage is dealt when Saskia's triggered ability resolves is not combat damage, even if a commander deals that damage (compare C.R. 120.2b, which describes damage due to an effect, with C.R. 120.2a, which describes combat damage).
It follows that if Saskia is your commander and it deals combat damage to a player (normally 3 [C.R. 510.1a]) while you control it (C.R. 109.5), whatever damage it would deal when its triggered ability resolves won't count as combat damage dealt by a commander.
Note that the comprehensive rules have no notion of "commander damage" as such (review C.R. 903), any more than they have a notion of "red damage", "trample damage", or "infect damage".
EDIT (Nov. 12): Clarification.
EDIT (Jun. 12, 2018): Added rule citation.
EDIT (Aug. 11, 2018): Correctness edits.
EDIT (Sep. 5, 2019): Edited, including because some rules were renumbered with Core Set 2020.
EDIT (Sep. 11, 2019): Edited note from Sep. 5, 2019. Minor edit elsewhere.
EDIT (Sep. 13, 2019; Nov. 11, 2019; Nov. 14, 2019; Aug. 13, 2020): Edited.
EDIT (Sep. 2, 2022): Add note.
http://www.youtube.com/watch?v=SY8h2vp5Xis
It follows that if Saskia is your commander and it deals combat damage to a player (normally 3 [C.R. 510.1a]) while you control it (C.R. 109.5), whatever damage it would deal when its triggered ability resolves won't count as combat damage dealt by a commander.
Note that the comprehensive rules have no notion of "commander damage" as such (review C.R. 903), any more than they have a notion of "red damage", "trample damage", or "infect damage".
EDIT (Nov. 12): Clarification.
EDIT (Jun. 12, 2018): Added rule citation.
EDIT (Aug. 11, 2018): Correctness edits.
EDIT (Sep. 5, 2019): Edited, including because some rules were renumbered with Core Set 2020.
EDIT (Sep. 11, 2019): Edited note from Sep. 5, 2019. Minor edit elsewhere.
EDIT (Sep. 13, 2019; Nov. 11, 2019; Nov. 14, 2019; Aug. 13, 2020): Edited.
EDIT (Sep. 2, 2022): Add note.