Supposedly it is likely that she will. However, there are cows (and heifers) that aren't too keen about kicking off their own calf even if there's a new one on the way. Domestication can be blamed for this, mostly because in some females the natural mothering instincts have been selected less so because it's the humans that are going to be working to make sure newborn calves are going to survive instead of letting the cow do her job. This is especially apparent in dairy cows. It can be a problem in beef cows that do not have as strong of mothering instincts as other cows do. However, if a cow is selected to and allowed to raise her calf as she sees fit (provided she gets the proper nutrition to be able to raise a healthy calf), she will more than likely know when and how to wean her own calf.
Yes, there are some cows out there that have no qualms with acting as a temporary surrogate mother to other calves that still have their mothers, but like to suckle on her. Some cows, though, go to the further extreme of stealing another cow's calf and having it nurse her along with her own calf. Sometimes these kinds of cows need to be separated from the herd, or culled, if it gets too bad.
They usually only have one calf, twins can occur but are very rare.
Camels only have one calf at a time. Having twins is unheard of.
Giraffes normally only have one calf at a time - twins are a rarity.
It doesn't work that way. A heifer calf is only infertile if she is twinned with a bull calf and if her and that bull calf share the same placental tissues. In most cases such twins are fraternal, but simply stating that fraternal twins versus maternal twins are more prone to infertility than the other is stating falsehoods.
Rare, but probably happens more often than what is noticed.
A cow will only calve once a year, and only give birth to one calf (twins 1:1000 births) at a time.
Camels typically give birth to a single calf, although twins are rare.
In most cows, the chance of a cow having twins is 0.1%. However, there are occasionally some cows that will calve twins all every season. Most cows, though, give birth to only one calf per calving season.
Two, but usually one.
Other than in a very rare case of twins, only one elephant calf is born at a time.
Usually a giraffe only produces one calf at a time. However, some instances of twins being born has been recorded.
Approximately 90-95% of heifers in heifer bull calf twins are able to become pregnant. It is possible for heifers to be fertile even when born with a male twin, but sometimes there may be complications due to hormonal influences during development.