Lady that's making my invitations won't give them to me! advice Pleasee!!!

Excuse the long post but I just don't know what to do anymore. I desperately need advise 😟

I paid this lady $179 IN OCTOBER 13 to make me my invitations she said I would have them in 4-6 weeks. November and December go by and I still dont have my invitations. I keep asking for updates and all she says is that she's working on them and that she will send them to me in a couple of days. January 18 I asked her how everything was going she said shes finishing them up and that she will mail them out by the end of the week and for me to send her the rest of the money which was 71.87 totaling up to 251.37. I let her know that I want to send them out no later than February 7 and she said I'll have them by them because she's almost done. To cut the story short, Last week (Thursday) she told them she mailed them and that I will get them tuesday or Wednesday (yesterday or today) and I asked her to give me a tracking number and she never replied back to me. I didn't get them yesterday so I asked for a tracking number again today to what she replied by saying that she will be mailing them out TODAY !! And that she'll send me the tracking number later. I asked if we can meet so that I can pick them up and save the shipping time and she never got back with me even though she's been on and off online in fb messages.

I'm so upset I've tried to be patient and nice but I just can't anymore, I hate the fact that she lied to me last week telling me that she had actually mailed them when in fact she didn't.
My fmil said that I should just take the loss and order invitations somewhere else. I ended up asking one of my friends (who happens to be a police officer) and he said I can file a complaint for "theft of service" I just dont know if I should do that or not, if I should just do as my fmil said and order new invitations or just be MORE patient and wait for her to actually mail them.