Don't give her anything. Hiccups are caused by excess gas in the stomach which enters when baby is suckling. Gripe water helps with stomach upset due to digestive discomfort. See the difference? So, don't give gripe water for hiccups.
SUGGESTIONS.
When hiccup happens:
1) always keep baby upright to reduce the impact(possible pain) experienced at that time. Do not keep baby on its back.
2) keep pressure away from baby's abdomen. Adds To Any Pain Or Discomfort Baby Feels During The Hiccup Episode. For example, don't put baby to your shoulders. Rather, keep baby on its feet support by your firm grips and play along while using the rest of your four fingers to pat baby's back.
3) You can also try breastfeeding. You know, adults drink water in gulps during hiccups. Same idea, Put baby to the fuller breast so that baby can suck in gulps. This helps to displace some air for escape as milk takes over.
4) it is very important that you burp your baby after feeding; and very well too. The better your baby belches, the less hiccups baby will experience.. Be patient if it takes long burping for baby to belch.
5) check your breastfeeding position for baby. Baby must latch proper as this also reduces the amount of air swallowed during feeding. Ensure the upper part of baby's body is always raised; and slanted.
6)do not put baby down to sleep immediately after feeding.
The above works perfectly for my baby and I. Hope it help you two one way or the other.
Cheers moms!