So sorry to hear about your loss. Losing a pet, especially one who has been with you for a long time, is just like losing a family member.
We have two dogs, an 11yo Border Collie, who has hip displasure, and a 9yo Lab-Ridgeback mix. We have had both of them since they were about 6 weeks old and I dread to think that one day we will lose one or both of them. Whenever one of them is away from our home (either at the groomers or the vet), the other one wanders around the house looking totally lost, until her sister comes home. Also, whenever my wife and I travel, they get so excited when we come back and their tails wag so fiercely that we’re always afraid they are going to knock themselves out. The first few days after we get back, they both sleep right outside our bedroom door and hover very close to us.
Don’t forget to give Shyloh extra hugs and tummy rubs and lots of attention, because she will be missing her sister too and will almost definitely be pining for her.