I think Andromeda likely waited a beat, looked at Ted and said that if she were going to inherit something from her side of the family, the sense of humour is the least offensive thing.
She would have given a mild congratulations, though asked about the medical concerns considering a metamorphmagus and a werewolf having a child is likely not a common occurrence and if there are things that may interact such as increased chance of multiples, chance of passing either on, if it is passed on would be more like an animagus than werewolves, is there going to be some weird cravings, etc.