(She said with a confidence she doesn't feel
I think so.
(He said with complete confidence, after checking the FAQ thread)
What is needed for an alternate or Lucky Loser doubles team to replace another doubles team in a qualifying/main draw?
If one player of a team doesn't send in picks, it is enough to replace them for an alternate/LL. Note: both players must have sent picks to be able to get in the draw as alternates/LLs.