Directly? Maybe not, although we do not know all about her travels. However, indirectly? There are a lot of connections that a very close between Blightshore and Laudna via Delilah.
Blightshore is on Wildemount. While on the Eastern side, there are settlements on it run by the Cerberus Assembly - New Haxon. They also have a presence in the other location there - Rotthold (in secret). There are over 400 Hollow Ones in Rotthold alone.
Delilah Briarwood if from Wildemount and has ties to the Cerberus Assembly (former Archmage of Antiquity). She studied necromancy and things that might help her keep Silas from falling to his disease. She was given aid by Vecna - who is the one with the fingers on all the secrets. His 'lab' location in Wildemount is still unknown, but the proximity to it might explain some of what takes place in Blightshore (just a speculative theory).
There are plenty of ways to tie Laudna's situation back to what took place on Blightshore.