at 13 months, all my kid said was 'mama' (but she didn't actually CALL me mama.. it was like shew was talking about me?) and bye but only sometimes. She did have a bunch of animal sounds which from what I understand count as words at this age as it is a specific imitated sound with a specific meaning.
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She added hi not too long later and dada by 18 months but she said none of them often. It wasn't until the last month where she really started to speak. Now she calls me ma and she talks about dada (he is currently deployed) and she says hi and bye. She says mine and baby. She also knows high and low.. she says waffle (wawa) and a few other things too.
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At 13 months, I wouldn't start worrying yet unless she also doesn't seem to understand you (my kiddo could follow really simple directions and knew the names of a lot of things although she wouldn't say any of it) or possibly even hear you. As long as she is showing an understanding of language at this point, I'd give it more time to let her start trying the words out. Like I said, its only been the last month my kiddo has started really talking and she turns 2 on Wednesday. Trust your instinct on if you think she is doing just fine with language :)