Okay... that sounds more like UT to me than OT. And UT baby can be cranky, but an OT baby is a mess for the most part... not just cranky, but I find that DD gets really grabby/jumpy/jittery when OT. UT naps are often impossible to extend since baby is not tired after a short nap...
To prevent your day from getting too long, I would cap her AM nap to get her more tired for the PM nap and hopefully get more than an hour there! If she is normally napping 90 minutes in the AM, try cutting her by 15 mins and see what that does
It will take a couple of days and remember that she may need a little less A time between naps when you cut it short