I got a text from my army recruiter today. She said MEPS put my packet on a 10 day hold. She said it’s not a bad thing. True?

Did you ask your Recruiter to explain the 10 Day Hold? Other than saying it's not a bad thing?

The recruiter would know why, therefore it is fare that you ask and are answered. Be polite, share your concern and ask what the reasoning for the delay is.

PFC (Join to see) first congrats on making a decision that will forever change your life. Second without seeing your initial enlistment documents there could be a few answers: as you said in an answer the 10 days could just be the recruiter waiting until January's mission, also there might be a waiver needed and the signing authority isn't available until that date. Most of here on RP enlisted or commissioned on waivers, I did as my mother had to sign an age waiver for me to enlist (I was 17 in my second year of college). Neither of these are bad things, as a Marine Recruiter only one of the applicants I processed for enlistment didn't have a waiver. A few had waivers that took months and a few more came back denied. My recruiter said something that would last with me until this day "the military like life is as hard as you make it, if you want it to be easy it will be." Good luck and let us know how things are going with you.