Unless she is getting clingy because she needs a father figure in her life, she just wants more money. Don't think for a moment that you are the only one she is trying to cling to.

I'm not young or athletic, but every now and then a provider will still turn kling-on. It sort of makes me shy to do repeats.

I usually just block their number and/or email and feel a little bad about it. Is there a better way to deal with it?

"No, Thank You" before blocking her number may be the nicest way to go about it.

On the other hand you could tell her that if she would like to schedule an appointment with you, that she would get a 50% discount off your normal hourly rate. I don't know what your normal rate is, but If I wanted to see you, I would jump at the chance for a half priced session!

Another good reason to not let women do outcall to my home.  I did have an experience (many years ago) where a woman got greedy/needy, and, after a couple of outcalls,  she just showed up at my home one day, and asked for money.  

My advice is to tell her no-thanks, and let it go. If she persists, block her calls.  

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You can opt out of all that credit card prescreened junk mail, with the added benefit that it often bumps your credit score a bit.