there's no such word in Russian, so i think you misheard
suffix -ка is a nouns suffix therefore it couldn't be appended to the verb смотрю even hypothetically
if i was to guess what she really said it could be смотрю что... (pronounced смотрю што... which is close to смотрушка) still sounds a bit off as the idea is incomplete but more likely than смотрушка, which sounds funny
a phrase "смотрю! что!" can sound rude or irritated if it's a response to the question что? which you asked, so it could be that, if she said it with matching intonation where there's a short pause between the words, in which case что! is mocking your question and is supposed to mean "why are you asking, don't you see?"
http://masterrussian.com/nounsandcases/suffixes.htm