Unfortunately your computer is an antiquity and really doesn't meet Minecraft's system requirements.
New computer time!
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Say something silly, Laugh 'til it hurts, Take a risk, Sing out loud, Rock the boat, Shake things up, Flirt with disaster, Buy something frivolous, Color outside the lines, Cause a scene, Order dessert, Make waves, Get carried away, Have a great day!
Did a quick Google search and that PC doesn't meet Minecraft's minimum requirements. Even if it did, it would be an awful, laggy experience when she tries to play Minecraft. You're going to want to get her a new PC to play the game on, if possible.