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Just reducing the A time to a reasonable time for her age (1hr 15 unless/until you work out her individual preference for shorter or longer than guidance times) will get her over the OT and get her back on track.
If you were also trying to sleep train at the same time as changing the routine you might do a couple of days without trying to sleep train and just let her sleep where most comfortable (usually that is on you) using any cuddling, rocking or feeding to sleep needed to keep her calm and well rested. If she likes to sleep in the cot or basket you could keep a hand on her throughout the nap and start a slight rocking or shush/patting whenever she stirs to help sooth her and keep her asleep for the nap length.
Staying home and having fewer visitors can also really help with getting over OT an OS. It doesn't need to be more than a couple of days I'd say, just a few quiet days without lots of new faces should help. Then perhaps try to limit trips out or visitors to once per day while she is so young, and try to keep her place of sleep consistent, that would help her get into her EASY routine.
hope this helps
