Hi Laura, and welcome to planDisney! It's lovely to have you visit with you for help with your summer visit to Disney!
After checking the official Walt Disney World website, it looks like Mama Melrose’s Ristorante Italiano is not currently available for reservations and may be temporarily unavailable. I also checked The Disney Parks Blog for an updated announcement, but one has not been released just yet.
Restaurant availability can change, so I recommend checking back frequently in the
My Disney Experience app or on the Walt Disney World dining page, especially as your visit approaches. Dining locations sometimes reopen seasonally or after brief refurbishments, so there’s always a chance it may become available again!
In the meantime, looking for a great alternative at Disney’s Hollywood Studios, you might consider
Roundup Rodeo BBQ for a fun family-style meal or
50’s Prime Time Café for comfort food with a side of nostalgia and fun.
Other Italian options are
Terralina Crafted Italian at Disney Springs,
Tony's Town Square at Magic Kingdom, and
Trattoria al Forno at Disney's Boardwalk.
Laura, if you find that you have more planning questions, please stop by and visit with us again soon!
Toodles,
Korliss