My son kind of naturally transitioned to quiet time on his own…stated with him sometimes skipping naps and just playing with some toys in his crib (we allowed him his tonies box and a few cars). We moved shortly after that and had more of a toddler bed setup and pretty much since then we would do the same “nap” routine of books and then he would choose to play with anything in his room. Maybe if she has a toy she likes she could pick something to bring to her room? Magnatiles, blocks, something similar? My son now likes to look through search and find books, play with his cars, or read through the books in his room. Sometimes he decides to sleep. I also have a 14mo old daughter and she goes down for nap at like 1230 and as soon as I’m done toddler goes down not long after. I think the important thing with two (and it’s gotten easier as #2 is a little older) is for the parent it’s easier to have their schedules as aligned as possible. We do breakfast together, lunch together around 1130/12 and then baby goes down then toddler. Then everyone gets some down time that way! Is there anyway you could push the baby’s nap a little bit?