It is sometimes possible to train kids this young. It's usually a case of the parent being trained to remember frequent potty stops, to learn to recognize their child's "about-to-pee" behavior and "most-likely-to-poop" schedule, and being willing to put up with frequent cleanups.
And even when the child figures it out, it's not always for keeps. Once the child realized the responsibility stretches on for the rest of her life, she not infrequently regresses. Regression is also extremely common with a new sibling distracting the parents, and many experts recommend NOT trying until the new family dynamics are established.
Every family I've known has had the best results with waiting until the child wants to train. And they do, just like they want to learn to walk and talk. It's excellent to talk about potty training and what the body does, it's great to play potty games with toys, puppets, and occasionally the child, it's great to read books and watch videos, to let her watch you use the toilet, to observe how much easier time she'll have when she learns to use the potty and doesn't have to stop for diaper changes. (I thought of this as "pre-training" with my daughter.)
And at some point, she'll start asking more questions, indicating that she wants to try, perhaps even sitting on the potty herself. She'll probably ask for big-girl panties. That's when you can let her know you'll help her remember; let her help you work out a plan so she's got some control, and go for it. Kids will often train in a matter of days at that point, with diminishing mistakes with every try.
Children who are ready for this step forward tend to take great pride in the accomplishment. Children who are pushed into it tend to become irritable and resistant, or even worse, begin to feel a sense of failure and frustration.
So, if you decide to go for it, and your daughter hasn't yet shown initiative or that she can reliably recognize her urges, be prepared with a timer, toys and books for the potty, and a supply of cleanup rags. Also, be aware that poop training and night training are sometimes separate steps for some children.
Best of luck to you both.