Danette Meyers, the prosecutor handling the case, told Radar Online that Lohan shouldn't even bother.
"It's a really a moot point to ask Judge Revel to send Ms. Lohan to rehab only as Judge Revel has already sentenced her," Meyers told the website.
"Ms. Lohan is going to jail," she said. "The only issue to be decided is what rehabilitation facility Ms. Lohan will be sent to after she serves her jail time."
Since her sentencing, Lohan has leaked a song about her troubled life and scrapped with comedian Joan Rivers.
Last week, the 77-year-old comedian mocked Lohan's knowledge of the legal system ("Lindsay Lohan said she wouldn't mind being under oath because she thought Oath was a Norwegian ski instructor") and joked about her hard-partying habits ("I was just reading about the new Lindsay Lohan diet, which is all liquid. 80 Proof").
"Joan Rivers and her 'stargument' make me believe that she and Michael Lohan are a match made in heaven," Lohan tweeted on Tuesday. "All he needs is her botox doctor. 'Dr.' Drew -- any ideas? Botox rehab reality show?"
Lohan then used the rhymes of rapper 50 Cent to suggest that because Rivers has had plastic surgery, she shouldn't talk. At all.
"In the words of 50 cent, You shouldn't throw stones if you live in a glass house and if you got a glass jaw, you should watch yo mouth," she tweeted.
Rivers took Lohan's snipes in stride. Today, she tweeted "Samantha, Lindsay...you're welcome!," along with a link to a CelebTV video about the rumors that Lohan and her ex-girlfriend, Samantha Ronson, have reconciled because of Rivers' jokes.
But Tuesday on "The Insider," Rivers took a more serious tone.
"That girl is going to be dead in 10 years if somebody doesn't take care of her," she said about Lohan. "The jokes, my God, were so minor. One was: She is not used to being in front of the bar; she is used to being under the bar. Silly little jokes that I put in my Twitter all the time. I suggest that this skanky little girl [Ronson] not worry about the jokes; worry about Lindsay. I find this insane that they are all feeding off of Lindsay. Maybe somebody should take care of Lindsay."
Ronson responded to Rivers before Lohan, tweeting last weekend, "Hey Joan Rivers," she tweeted. "You have collagen older than Lindsay, pick on someone your own age, oh wait I guess people that old can't hear."
When a follower of Ronson's pointed out that Rivers' job is to jab, the 32-year-old DJ replied, "She's not at all funny." But Ronson got a smile out of Lohan -- on Saturday, Lohan retweeted her ex's message with the note, "thank you ;) I love yams x ."
Don't expect the battle to wage on. Asked if Ronson would share her thoughts on Lohan's sentence and Rivers' jokes, her rep told ABCNews.com, "She does not comment on that subject."
But at least one person might turn the Twitter back-and-forth into a greater project. Dr. Drew Pinksy responded to Lohan's Botox rehab reality show suggestion Tuesday, tweeting, "Thanks @lindsaylohan sounds like a terrific plan! Actually happy to see you have retained your sense of humor despite your circumstances."