sounds like my kids in a GS as well, Becky. Always loved them for not waking in the night but again, they were whacked from eating every 1.5 hrs in the day ;-)
Emma did begin to wake again for a 3am feed at the 12 week GS (she'd been doing 7-7 with DF from 10 weeks) and by 13 weeks we were back to STTN. Oscar still hadn't gotten to STTN at 12 weeks but his 5am feed moved back to 3am and then gradually forward again till we were STTN iykwim.
Hugs and well done little Martha. She has an angel spark there afterall ;-) Spirited/Angel that is ;-)