This is from the fandom wikia page:
"Michael Chu has indicated that Sombra considers Reaper and Widowmaker to be genuine friends of hers, but that the friendship is “complicated.”
I don’t know or even care who this guy is. Yeah, I read his info. So, I really don’t know where he’s getting this. It doesn’t make any sense.
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Sombra is only using Talon and the people therein for her own gains, while she tries to do her own thing. And if I recall Fist’s and Reaper’s conversations, they’re aware of it or at least suspect it.
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Sombra’s pre-match exchanges with Widowmaker definitely don’t sound friendly. Widowmaker is definitely antagonistic towards her.
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Her scenes with Reaper, in the latest comics, where she’s condescendingly telling him he’s not in the army or military, and calls him “soldado” (probably mockingly). Sure, she’s telling him he can trust him, but where does she get off talking to Reyes like he’s some green, wet-behind-the-ears rookie who doesn’t know how the world works?
Saying she considers them to be genuine friends makes no sense, at all.