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What kind of chicks are you comparing your EE to? EE's can be pretty large, so if you aren't comparing her to other EE's that may be part of the size difference you're noticing. Three weeks is really to early to try to sex most breeds.
Where did you get the from? It's possible the SLW could be a bantam. A 2-3 week age gap would probably be fine IF there is enough space in your brooder to add another. Chicks don't do well being raised as singles, so if you want to brood separately from your others you really need two. Personally I wouldn't put one 2-3 day old in with 2-3 week old chicks, two 3-4 day olds? Maybe. I would honestly wait at least a few more weeks to buy any additional chicks.