It is because the verb, to think of someone is -
penser à quelqu'un
and you just can't lose the à.
So you can only say:
La fille à qui/à laquelle je pense est...
Hope this helps
Quant à moi, since we have the Nom “La fille” and you wanted say ‘i think of someone’ French;;Je pense à quelqu’un
Then we are better to use the “à”in the expressing without Omitting it
Donc,On écrira “La fille à qui je pense est belle”
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