Need referral for a company/group who can tear a house apart (if necessary) to find the source of a mold problem

My friend is having continuing symptoms of mold exposure even after professional remediation has already. It was started from defective window installation where the and defective window glazing, and broken window seals, and they weren’t sealed in when they were installed , so water leaked in. The mold was hidden behind the drywall underneath the window. It was in just I e room at first, and she had it remediated, but now she is having mold reactions in several other rooms. Possibly it’s gone into the air ducts. She’s going to have the different rooms tested, but she needs someone to go into various materials in the house to test for hidden mold in the walls or floors.