This is early days, and the cat is not used to having a home and human security. Many street cats will hiss at humans, but luckily your cat is wanting affection, which ultimately will make a more loving pet, one that you are able to be close to and not need to coax out of hiding.
When you see the cat or she meows for you, go to her and pick her up or pat her. Talk to her and praise her. They don't understand words, but they can pick up feelings from people and tone of voice.
A pet is a time commitment and for any pet, the first weeks and months are the settling in time where you're both getting to know each other. Patience is a key here for every owner. We need to lead for the pet and understand that they are in an unfamiliar circumstance and need reassurance, whatever behaviours they are showing. In this case it is straight forward.
Your cat is clingy, and she will settle over time, but sounds like she will be the sort of cat that will always want to be around you. That can be annoying at times when my cat wants to climb on my keyboard, between me and my screen, as he sees where my attention is focused and wants to insert himself into that.
Plenty of pats when she's not meowing (if possible) and another trick is to pick her up, give her a cuddle and a smooch and then put her down and ask her to follow you. Get her used to not being abandoned and you can train her to follow you without panic, as when you put her down, she still has your attention.
It will take some consistent effort. If you put a lot of time into this for the next few days, you'll notice she will start to settle. If you are pushing her away or agitated with her, she will feel insecure. She is terrified, as she does not understand what this home is and how long it will last. She's gone from the street, to a shelter and now your home. Imagine how lost such a small creature would feel and remember to just simply reassure her with a kind attitude. I have found kindness goes a long way when dealing with pets.
Let me know how this goes and if you need more assistance.