LOL at the baby blindfolds.
is she falling asleep at the beginning of her nap independently now? how long has it been since you stopped holding her to sleep? if she's used to a prop to sleep this may be causing her short naps (she's waking during the transition phase at the end of the sleep cycle instead of transitioning herself because she needs the prop). you should be trying to put her down in her bed before she is asleep, don't let her fall asleep while you are holding her - not sure if you are doing this?
you have the right approach to shorten A times and fit in more naps if they're all short.
at 3 mo it's possible she's not ready for 1.5 hours first thing. often this one is shorter than the rest. what happens if you try putting her down at 1 hour 20 min first thing?