According to the IRS definition, it is for lodging, meals, and incidental expenses incurred when travelling. I do not have any receipts other than the expense report showing the business purpose of the trip, date and place.

Per diem is allowable for assignments shorter than one year. Since her project was for almost eleven months, the total per diem paid is a large amount at the end and I do not want to raise any flags even though I followed the IRS directions and limitations. I understand there isn't a specific location for per diem and I will need to distribute it towards different categories such as travel, meals and maybe a few more preset categories as you have suggested.

By the way, how do I create a new category under the business expenses in the Business version? Is it through "All other expenses" and then I manually write the description?

Yes ... just follow the interview ... after the preset categories you will be able to "make your own".

As you say, just be sure to split it for the meals apart from the rest of the per diem. Meals are subject to the 50% limitation, so that needs to be separated out from the rest of it.

Do you mean, it is better to completely distribute it in different categories other than the meal?
Thanks to both of you for your comments.

Yes.  Report the portion for meals under Meals, everything else under Travel.