Money owed....

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So,I'm not really sure if this is a controversial topic or not. Anyways...I'm a military wife and we move every 1-2 yrs. I have a degree but it's hard too use since I'm never in one spot long enough. I've resorted to babysitting and I actually love it! I was watching a little boy whose Mom was single and money was tight. She never paid me on time and was always behind but eventually she would catch up and at times would pay me $600 at a time to catch up. Anyways she's now behind $800 hasn't brought her son to me all week and have blocked me on Facebook and on the phone.Ive contacted her Mom and Sister and they've both read my Facebook message but never replied back.Anyways I know where she works,would it be immature or too much drama too just walk in and sit at her desk and talk to her? I wouldn't be rude or try to create drama,I'll actually be calm and respectful since it's her job.Or should I just scratch it off as lesson learned and let this one go? Uhg,I'm just so disappointed in her!

***Update,since I know where she works I will serve her their and take her too small claims court***

***Update*** So I know alot of you suggested that I don't go to her work but I did anyways,lol. I scheduled an appt and requested to speak with her personallyrics. Husband and I were very nice too her when we walked in. We sat at her table,asked how she was,asked how the baby was and told her we missed him. We then proceeded to ask if and when she would be able to pay us for his care. You could tell she was embarrassed and even nervous. She said I can pay you you right now. She walked over to the ATM withdrew what she owed and paid an additional $100 for the inconvenience of her being late. So glad this is over and I definitely learned my lesson!