女 is woman. 爰 is the original character for 援, used to write a word meaning to pull. Older forms show that 爰 depicts hands at the upper and lower part of an object that may have been a rope or a rod¹ to convey this word to pull. 爰 is the phonetic in a range of characters. Here, through the meaning to pull in combination with 女 woman, it may (also) hint at the attraction between a man and a woman, in that way pointing to a word for beautiful (attractive) woman.² In Japanese 媛 came to mean a young woman of high social status.
Mnemonic: a princess is a woman who pulls your rope
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