I think we'll probably need a double
She's reasonably good at staying with me so we don't usually use the buggy unless we're going out for long walks but trying to keep tabs on her and push a buggy seems like too much hard work! She hates toddler reigns & won't walk with them on.
I can't wear a sling because of back problems otherwise that would be a good option, although in saying that DH tried with DD & she hated the slings/carriers. I reckon if she saw a baby in a buggy, she'd want to sit next to it. Although a side by side means it's time is limited! I've heard good things about the nipper but I'm worried she'd use it for 6 months and then we'd have a non convertible double. Phil & ted doubles look good because they convert but I know she'd be leaning back to see baby behind her.
Not sure about a buggy board- we have a bugaboo bee which she's really too tall for but we could use a board with it. We'll try her on one in John Lewis soon. I'm worried she'd get distracted when there's lots going on & end up falling off because she wasn't holding on properly though!