The 3/4" pine should be fine at her weight. The curly maple is better at 3/4" as it will hold a screw more firmly than the softer ponderosa pine. But.. as long as she is not racking the bed diagonally the pine should be no problem. Kids tend to jump up and down on beds but usually apply very little diagonal forces other than plopping down which isn't a biggie.
The reason I mentioned the hardware with the most screw holes is to boost the fact that a screw can work loose in softer woods. Several options.. you could just drill a couple of additional holes to apply screws.. you could glue another piece onto the inside of the rail at the ends only to laminate the 3/4" to 1".. etc. That would allow you to use longer screws in #8 or even #10 if you really want to bolster the connection. And I would definitely use sheet metal or any type screw with threads all the way to the head to give more bite. IMO.. in this case a wood screw (non threaded portion at top) is not the correct call for this application. Personally I use fully threaded screws anytime I use screws which isn't often but I want a full bite all the way.
So... bottom line is the pine should be fine. You can check the rail in a few months once in use to tell if the screws are working loose. If so.. you have options to bolster at that point. I cannot see over an hours labor even if you did have to modify on the fly due latter.
You should be good to go....
The reason I mentioned the hardware with the most screw holes is to boost the fact that a screw can work loose in softer woods. Several options.. you could just drill a couple of additional holes to apply screws.. you could glue another piece onto the inside of the rail at the ends only to laminate the 3/4" to 1".. etc. That would allow you to use longer screws in #8 or even #10 if you really want to bolster the connection. And I would definitely use sheet metal or any type screw with threads all the way to the head to give more bite. IMO.. in this case a wood screw (non threaded portion at top) is not the correct call for this application. Personally I use fully threaded screws anytime I use screws which isn't often but I want a full bite all the way.
So... bottom line is the pine should be fine. You can check the rail in a few months once in use to tell if the screws are working loose. If so.. you have options to bolster at that point. I cannot see over an hours labor even if you did have to modify on the fly due latter.
You should be good to go....
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