First, regarding the OS, assuming she purchased it brand new, it either has Mountain Lion (OS 10.8.x), or Mavericks (OS 10.9.x). There is actually a newer version of the OS called Yosemite (OS 10.10.2 (latest version)). She can upgrade to it for free.
Secondly, there are versions of Acronis for PCs (
http://www.acronis.com/en-us/personal/pc-backup/), and for Macs (
http://www.acronis.com/en-us/personal/mac-backup/). Each one would need to be run separately to back up the respective systems (I'd be very surprised if, say Acronis for the PC, could backup the Mac partition). So, for backing up the Mac partition, she can use either SuperDuper! (again, that makes the backup bootable), or the Mac version of Acronis (not sure if it makes the Mac backup bootable). Additionally, does the Acronis PC backup software make the backed up external partition bootable?
Third, how does she "get to" the Windows software on the (internal) Windows partition? In the Mac "world", there are three tools for doing that: Boot Camp, Parallels Desktop, or VMware Fusion (I believe there are a couple of others, but those 3 are the "best"). The Boot Camp "method" is free, but there are disadvantages to using it. From numerous reviews, the other two are about "neck and neck".
As for a complete recovery, what could be possible is:
1) Assuming she uses SuperDuper! for the Mac backup, launch the SuperDuper! backup.
2) Using Disk Utility on that SuperDuper! backup, erase everything on the internal hard drive, format the drive, and create two partitions (one for the Mac stuff, and the other for Windows).
3) Restore the Mac "stuff" using SuperDuper! on that Mac backup.
4) Here is where I don't know how she would "get to" the Acronis external backup, boot from there, and then do a restore to the Windows partition created in step 2 above.
Maybe someone else could "chime in" here, and offer further advice/information.