Hello and welcome to the boards!
Please will you post your sleep routine, tell us what time these naps are falling at, etc, and it will be easier for folk to comment on your situation. But briefly I would say that at this age, most babies will be doing two naps, rather than three, and your problem may be solved just by moving her sleeping times around a wee bit. Tell us when and how long that first nap is, and what happens after!