By coming out to Maverick and telling him about her relationship with Moe, Ma shows that she’s ready to treat Maverick like an adult. She expects him to respond kindly and appropriately—and though Maverick is shocked, he does. This also explains why Moe didn’t stop by over Thanksgiving: Granny was there, and she doesn’t approve of Ma and Moe’s relationship. Hearing that Ma is in love and happy also means that Ma is growing her own support network. Now, she doesn’t have to rely solely on Pops and Maverick.