No she's not pregnant.

Dry humping can still lead to pregnancy but it is a very low possibility that she would be. The increased risk is if it is a thin material like just underwear

My partner and I have sex with our clothes on?

It is possible to become pregnant while engaging in sexual intercourse while fully clothed, if the man ejaculates and the semen soaks through the clothing and reach your vagina. You are at greatest risk if the clothing is thin and you rub together for a long time after he ejaculates. Regardless of whether your bodies are separated by material, clothing is not a form of birth control. Clothing does not prevent semen form entering the vagina. The only protection from pregnancy is the consistent use of some form of birth control, such as "the pill" or condoms.

Http://www.Soc.Ucsb.Edu/sexinfo/?Article=f aq2&refid=003#1

here some info on dry humping along with the website address

Dry sex/outercouse or sometimes called "dry humping" is the simulation of sexual intercourse while wearing clothing. The risk of pregnancy and stds are very low with the activity assuming each partner is wearing pants. If practicing dry sex in just underwear, pregnancy can become a risk. The loose cotton weave of underwear is not nearly enough to stop sperm from reaching the vagina.

Http://www.Teenadviceonline.Org/articles/s exfaq.Html

There is a very small chance she got pregnant and the morning after pill would have helped so if I was you I wouldnt worry she is fine and her stressing can make her period late of even miss it this month! Have her take a home pregnancy test just to ease yalls mind but she should be fine!