Tips on how to deal with coworkers who interfere with my personal life?

One older lady coworker of mine (we share the same office) used to be extremely nice to me. I learned a lot from her and I definitely thought she was a great person. She has a daughter who is stage 4 breast cancer patient who is still going through chemo therapy. My coworker tried to set me up with her daughter, but I declined. I am a single father, and I focused my attention on my kid for the past several years, but now, I am dating this wonderful lady whom I am head over heel in love with. My coworker noticed changes in me (I seem to be happy all the time), and I told her about my lady. She seemed to be very happy for me and told me "It's about time for you to find somebody."
Recently, my coworker learned her daughter is not 100% cancer free, so she has to take personal phone calls from her daughter at least 7 - 8 times a day, and each time, they talked on the phone for at least 20 minutes and /or longer. (I didn't say anything) I only talked to my girlfriend on the phone on my

lunch break, and whenever I have a chance, I looked at my girlfriend's pictures on the computer. Lately, coworker has been making comments like "Oh, you got a phone call again." "Oh, you sure do get lots emails don't you?" Yesterday, she left the employee's manual on my desk hinted that I have not been doing my job right.
I can honest say that I am an extremely hard worker, and almost everybody values my opinion in this company. So I got really offended. It seems like she has this double standard, whenever she gets a phone call (personal) it is okay, but whenever I call my girlfriend (on my break) It is not okay with her. I still respect her, and I tried to figure out why the sudden changes. The last time she tried to ask me to go out with her daughter was about 1 year ago, so I honestly don't believe she's jealous or anything. What seems to be her problem? I am completely clueless here.

Man. That's a tough one. Perhaps you should just confront her (it sounds like you two have had a good working relationship for a while) and let her know that if you did something to upset her you apologize. Then let her know that you enjoy working with her and would like to have the good relationship back. You kind of want to kill her with kindness, so to speak and open it up completely so she can't just run and hide and smolder. That way, you'll figure out what's in her mind, and be a better person for apologizing when you really didn't need to. How can someone not feel bad and make an effort to fix that? Good luck.

Be afriend to her.
Her child is sick, and she may not have anyone to talk to.
take her to lunch and have her share her feelings.
dont take it personal,
she is going thru a rough time and she needs a shoulder to cry on.

Grow balls.