Any deep chested dog is susceptible to bloat - I'm having a hard time picturing your dog, so if you could provide a photo that would be great
Signs of bloat don't develop over months - they develop over hours. What you're describing doesn't sound like bloat, but the weight loss would be a concern and I probably wouldn't wait until February to have that checked out. That said - is it possible your dog was overweight previously and she's down to a healthier weight now? Best to have your vet confirm it
Good luck!