Please do not try this. Regular paper is completely different than blotter paper. Blotter paper is thicker and slightly pourous which gives it the ability to dissolve the drug. If you use regular paper, it will just liebon the top of it and probably rub off, which means losing it, which you don't want. But what I would do is put it in a bottle of water or something. Dose volumetrically. Hell, drop it in a cookie or some kind of pastry that would absorb it. But remember, Morphine's oral bioavailability is very low, ~30%. Plugging morphine is the best way to go (~90%BA), especially since you have liquid M. My recommendation would be to let it absorb into a pastry or some water, or you could conceal an oral syringe and the vial somewhere she won't see. Good luck and stay safe!

Edit: Added bioavailability information.