I can understand your frustration. Thank goodness for Baby Swap (especially if you have older kids who will get to ride the second time through with the Swap parent) Here are some suggestions based on experience by park
AK
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Kilamanjaro Safaris - if your party has FP's then wait up on the bridge and try to shoot your party with the elephant squirters (my kids thought this was a blast and one actually skipped riding it a second time in order to get ME!)
Dinosaur (although I can't think that a kid would feel they were missing out on that one LOL!) go to the Boneyard for a while
Primeval Whirl - go do TriceraTop Spin again
Epcot
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Test Track - Head over to Mexico and do Rio Del Tiempo and get an order of sopapillas (even with FP's this ride tends to break down often giving it a long wait time even when you are buckled in ready to go)
Body Wars - Cranium Command and/or Making of Me (and then spend some time doing all the wonderful hands on things)
Magic Kingdom
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BTMRR and Splash - Go to the Laughing Place, head over to TSI or (depending on show time) catch Country Bear Jamboree. If your party is going to do both (we FP one and go get in the line for the other) and your kid is tired a ride all the way around the park on the railroad is a great break from the day.
Space Mt. or Extra Terrorestrial (ditto Dinosaur on ET LOL!) - there are lots of things to do here: Buzz, Indy Speedway, TTA, Teacups.
These are all the height restrictions in this park. I listed things that were close by the other rides, but there is no reason that you couldn't hang out in Fantasyland and let your party come to HER since SHE is the one that is "missing out" on the "big rides" This may even be a prime time to go meet some characters, do some shopping or get a special treat (Dole Whips, Mickey Bar, Cookies, Ice Cream sundae, etc.)
MGM
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Star Tours - Muppet 3D
RnR or TOT - Playhouse Disney or BATB Live on Stage.
This is a small enough park (IMO) that there shouldn't be anything that you can't get to in a short amount of time, so letting her decide what SHE wants to do might be a fun thing to do. She might like to go to SciFi theater and get a treat or perhaps go hunt for some characters over at Pizza Planet.
Hope you have fun!