Summer's in 0.6.0 so check your version. If you're on 0.6.0 and you're past the prologue, you'll need to start Sammy's route in order to meet her.
Ok, thanks for the help! Is this the same situation for the shark girl (I forgot her name)? So far there was only one interaction with her.
Yes, she is also part of the 0.6.0 update
